Deprecate helper and computed property names, removed EnumerableUtils.map, updated ember-cli-moment-shim

• Deprecate helpers: moment, ago, duration in favor of moment-format, moment-from-now, moment-duration
• Deprecate computed property modules:
  • ember-moment/computeds/ago -> ember-moment/computeds/from-now
  • ember-moment/computeds/moment -> ember-moment/computeds/format
• Removed usage of Ember.EnumerableUtils
• Updated ember-cli-moment-shim to 0.6.0
  • moment is now brought in via bower instead of npm (jasonmit/ember-cli-moment-shim#14 (comment))