[TASK] Rework the REST controller to configurable HTTP

This change reworks the REST controller so it is
compatible with the configurable HTTP method change
in Flow: https://review.typo3.org/#/c/19801/
[FEATURE] Add GET support for an jsonapi interface

This change introduces the GET method for a jsonapi
like interface. It adds basic support for compound
documents and links.

TODO: Fix the url generation for resources
[TASK] Update notification channel to t3pb

This package is mainly meant to be open source and
actively used in the package builder. So the
notifications are now sent to the t3pb team channel.
[TASK] Cleanup library versions

This change removes all older versions and updates
the latest release to 1.0 RC5. This is in line
with tagging a version based on Ember 1.0 as soon
as it's released.
Also removes the adapter version configuration as
it's no longer supported by the RESTAdapter.
[TASK] Simplify REST adapter
[TASK] Kickstart simplified adapter / serializer

Not finished yet.
[TASK] Add handling of receivedData

This change detects if a model is posted to the
and maps the data to a model argument.
[TASK] Add some mostly project specific hacks

Those hacks will have to be removed later on
[!!!][FEATURE] Allow custom suffix for handlebar templates

This change allows for different suffixes for the
handlebar templates and defaults to .hbs
[TASK] Code cleanup
[TASK] Remove project specific hack
[MERGE] Merge configurablehttpmethod branch into master
[TASK] Update ember to RC6