[BUGFIX beta] Add ember-template-compiler package.

Conflicts:
	packages/ember-htmlbars/lib/main.js
	packages/ember-htmlbars/lib/system/bootstrap.js
	packages/ember-htmlbars/tests/compat/make-view-helper_test.js
	packages/ember-htmlbars/tests/helpers/partial_test.js
	packages/ember-htmlbars/tests/helpers/template_test.js
	packages/ember-htmlbars/tests/helpers/with_test.js
[BUGFIX beta] Rename registerASTPlugin to registerPlugin.
[DOC beta] Fix submodule for ember-template-compiler modules.
[BUGFIX beta] Add precompile to ember-template-compiler.