Remove "ember-mocha" bower dependency
Remove "ember-mocha" bower dependency

This was replaced by a npm dependency
switchfly/ember-cli-mocha,switchfly/ember-cli-mocha,ember-cli/ember-cli-mocha,trentmwillis/ember-cli-mocha,trentmwillis/ember-cli-mocha,blimmer/ember-cli-mocha,ember-cli/ember-cli-mocha,blimmer/ember-cli-mocha