Even more explanation. Closes #396.

Contribute.markdown

@@ -1,7 +1,5 @@
 # Developing for Jasmine Core
 
-## How to Contribute
-
 We welcome your contributions - Thanks for helping make Jasmine a better project for everyone. Please review the backlog and discussion lists (the main group - [http://groups.google.com/group/jasmine-js](http://groups.google.com/group/jasmine-js) and the developer's list - [http://groups.google.com/group/jasmine-js-dev](http://groups.google.com/group/jasmine-js-dev)) before starting work - what you're looking for may already have been done. If it hasn't, the community can help make your contribution better.
 
 ## General Workflow
@@ -14,7 +12,49 @@ Please submit pull requests via feature branches using the semi-standard workflo
 1. Push to the branch (`git push origin my-new-feature`)
 1. Create new Pull Request
 
-## Install Dependencies
+We favor pull requests with very small, single commits with a single purpose.
+
+## Background
+
+### Directory Structure
+
+* `/src` contains all of the source files
+    * `/src/console` - Node.js-specific files
+    * `/src/core` - generic source files
+    * `/src/html` - browser-specific files
+* `/spec` contains all of the tests
+    * mirrors the source directory
+    * there are some additional files
+* `/dist` contains the standalone distributions as zip files
+* `/lib` contains the generated files for distribution as the Jasmine Rubygem and the Python package
+
+### Self-testing
+
+Note that Jasmine tests itself. The files in `lib` are loaded first, defining the reference `jasmine`. Then the files in `src` are loaded, defining the reference `j$`. So there are two copies of the code loaded under test.
+
+The tests should always use `j$` to refer to the objects and functions that are being tested. But the tests can use functions on `jasmine` as needed. _Be careful how you structure any new test code_. Copy the patterns you see in the existing code - this ensures that the code you're testing is not leaking into the `jasmine` reference and vice-versa.
+
+### `boot.js`
+
+__This is new for Jasmine 2.0.__
+
+This file does all of the setup necessary for Jasmine to work. It loads all of the code, creates an `Env`, attaches the global functions, and builds the reporter. It also sets up the execution of the `Env` - for browsers this is in `window.onload`. While the default in `lib` is appropriate for browsers, projects may wish to customize this file.
+
+For example, for Jasmine development there is a different `dev_boot.js` for Jasmine development that does more work.
+
+### Compatibility
+
+* Browser Minimum
+  * IE8
+  * Firefox 3.x
+  * Chrome ??
+  * Safari 5
+
+## Development
+
+All source code belongs in `src/`. The `core/` directory contains the bulk of Jasmine's functionality. This code should remain browser- and environment-agnostic. If your feature or fix cannot be, as mentioned above, please degrade gracefully. Any code that should only be in a non-browser environment should live in `src/console/`. Any code that depends on a browser (specifically, it expects `window` to be the global or `document` is present) should live in `src/html/`.
+
+### Install Dependencies
 
 Jasmine Core relies on Ruby and Node.js.
 
@@ -34,7 +74,7 @@ To install the Node dependencies, you will need Node.js, Npm, and [Grunt](http:/
 
 ...you see that JSHint runs your system is ready.
 
-## How to write new Jasmine code
+### How to write new Jasmine code
 
 Or, How to make a successful pull request
 
@@ -47,11 +87,7 @@ Or, How to make a successful pull request
 
 Follow these tips and your pull request, patch, or suggestion is much more likely to be integrated.
 
-## Development
-
-All source code belongs in `src/`. The `core/` directory contains the bulk of Jasmine's functionality. This code should remain browser- and environment-agnostic. If your feature or fix cannot be, as mentioned above, please degrade gracefully. Any code that should only be in a non-browser environment should live in `src/console/`. Any code that depends on a browser (specifically, it expects `window` to be the global or `document` is present) should live in `src/html/`.
-
-## Running Specs
+### Running Specs
 
 Jasmine uses the [Jasmine Ruby gem](http://github.com/pivotal/jasmine-gem) to test itself in browser.
 
@@ -71,4 +107,5 @@ Jasmine uses Node.js with a custom runner to test outside of a browser.
 1. Ensure JSHint is green with `grunt jsHint`
 1. Build `jasmine.js` with `grunt buildDistribution` and run all specs again - this ensures that your changes self-test well
 
+Note that we use Travis for Continuous Integration. We only accept green pull requests.