F2 version 1.3

Previously 1.2.2 tracked in #120, we're bumping the minor version to 1.3.

Changelog for version 1.3:

- [x] Fixed #11 by replacing `jQuery.ajax` with `document.createElement('script')` 
- [x] Updated the example containers when using IE
- [x] Fixed #35 with a new Grunt task
- [x] Added a `grunt packages` task for compiling the [F2 packages](http://docs.openf2.org/f2js-sdk.html#packages) with a single command
- [x] Fixed #122 
- [x] Added `debugMode` option to `F2.ContainerConfig` enabling some additional logging
- [x] Updated the `F2.log` API per #123 while we continue to evaluate suggestions in #91
- [x] Removed the duplicate `readme` content on the SDK docs landing page, replaced it with a redirect to the [F2 class](http://docs.openf2.org/sdk/classes/F2.html).