Add @since to most JSDoc comments

- See jasmine/jasmine.github.io#117

src/core/matchers/toContain.js

@@ -3,6 +3,7 @@ getJasmineRequireObj().toContain = function() {
    * {@link expect} the actual value to contain a specific value.
    * @function
    * @name matchers#toContain
+   * @since 2.0.0
    * @param {Object} expected - The value to look for.
    * @example
    * expect(array).toContain(anElement);