Composer packaging to make us available as a library

Change-Id: I60fd5b58db20e43df341f065dc25e4cefe843b77
fixups for unfork

Change-Id: Ibd8bb393eed1f90c88c271359c28fed947fa845b
Start a new branch for Drupal and embedding

This branch will be where we track deployment to Drupal.  There are two
very minor (but unfortunate) code changes to maintain:
* Remove the MediaWiki version of WmfFramework, so that we can use
Composer's classmap compilation feature.
* Disable MediaWiki tests, since the above change is breaking.

Change-Id: Ia1dfbe8a0531d39e706f75fd5f7245cdd50bd55f