* upgraded ember-moment and use it application-wide service to set locale
* label on poll/participation now observes locale changes, but it's still hacky
* replace computed property on views poll by moment-format helper of ember-moment
started replacing ember-easy-form-extensions by ember-form-master-2000
and ember-validations by ember-cp-validations
using ember-form-master-2000 in old 0.2 release cause newer releases does not work with ember 0.12
should move to ember 2.x as soon as possible
therefore ember-easy-form-extensions has to be dropped and ember-i18n been updated
part of #76
