Add Ember.js template precompile filter

Adds a filter to precompile Handlebars templates for use in the
Ember.js framework.
Updates travis.yml and docs

Updated the docs for the TypeScript filter and the Ember.js precompile
filter. Updates travis.yml to include ember-precompile npm package in
the CI build.
Fixes return code and environment var

Fixed return code check for those Windows systems that return negative
exit codes. Also renamed HANDLEBARS_BIN to EMBERPRECOMPILE_BIN.
Merge remote-tracking branch 'Blackshawk/master'

Conflicts:
	README.md