Add jQuery postMessage Typescript definition file.
Add new line at end of the file.
Use standard header template in definition file.
Add some small tests for jQuery postMessage definition file.
Add new line at the end of the test file.
Merge branch 'jQueryPostMessage' of github.com:lijunle/DefinitelyTyped into lijunle-jQueryPostMessage
rename jquery.postMessage/jquery.postMessage-test.ts -> jquery.postMessage/jquery.postMessage-tests.ts
Merge branch 'lijunle-jQueryPostMessage'