initial commit of placeholder changes

* fixed duplicate sourcemap call in Gruntfile
* added F2.loadPlaceholders
* fixed comments surrounding the CSS classes that are applied to apps
when rendering
* fixed a bug where the wrong CSS classes were being applied with the
default AppHandlers
* added logic to allow placeholder apps to bypass AppHandlers
* added autoload logic for placeholders
* added a basic container to demonstrate placeholder functionality
* added unit tests surrounding placeholders
* fixed a bug in the example containers where the proper CSS classes
were not being applied
minor updates

* fixed failing unit test that appears unrelated to these updates
* removed debug logging
Merge remote-tracking branch 'remotes/origin/1.4-wip' into app-placeholders

Conflicts:
	F2.latest.js
	sdk/f2.debug.js
	sdk/f2.min.js
	sdk/f2.min.map
	sdk/f2.no-third-party.js
Recompile JS
enhancements

- removed all dependency on jQuery except for DOM ready
- expanded autoload functionality to classes and attributes
- added additional unit tests
fixes example container to match F2.js updates
supporting batch requests and secure apps via data attributes
supporting batch requests and secure apps via data attributes
Merge pull request #169 from OpenF2/app-placeholders

App Placeholders