Added better_errors gem

Fixes #700
It's version limited as v2.0 only supports Ruby 2.0+
For #701 import wizard now ignores case on select ones
Fixes #701 select many ignores case on wizard import
Fix Site filter by name by pressing enter

Related to #738
Minor: rewording sites array

See #738
Collection search tests

See #738
Renamed 'name' field for fixing site's export

Fixes #726
Filtered collection export spec

See #726
Pending filtered collection specs with whitespaces

Filter fails when the sitename has any whitespace
See #726
Field types translations

See #732 item 9:
"Collection: translate name of the fields"
Fixes #747 extra hierarchy columns are marked as ignore in wizard import
For issue #590
Removed HipChat notifications. Added Slack notifications
For #607 Fixed table header in memberships
Fixed snapshot icon in collection list
Merge branch 'master' of github.com:instedd/resourcemap into ruby-2.1.2

Still some broken tests, will be fixed in the next commit

# By Matias Garcia Isaia (8) and others
# Via Valeria Tiffenberg
* 'master' of github.com:instedd/resourcemap:
  Fixed snapshot icon in collection list
  For #607 Fixed table header in memberships
  Removed HipChat notifications. Added Slack notifications
  For issue #590
  Fixes #747 extra hierarchy columns are marked as ignore in wizard import
  Field types translations
  Pending filtered collection specs with whitespaces
  Filtered collection export spec
  Renamed 'name' field for fixing site's export
  Collection search tests
  Minor: rewording sites array
  Fix Site filter by name by pressing enter
  Fixes #701 select many ignores case on wizard import
  For #701 import wizard now ignores case on select ones
  Added better_errors gem

Conflicts:
	Gemfile.lock
	spec/controllers/collections_controller_spec.rb
Fixing broken tests due to the pull from master, and deprecated methods still used on master development. Related to #740