Add @since to most JSDoc comments

- See jasmine/jasmine.github.io#117

src/core/matchers/toBeLessThan.js

@@ -3,6 +3,7 @@ getJasmineRequireObj().toBeLessThan = function() {
    * {@link expect} the actual value to be less than the expected value.
    * @function
    * @name matchers#toBeLessThan
+   * @since 2.0.0
    * @param {Number} expected - The expected value to compare against.
    * @example
    * expect(result).toBeLessThan(0);