applied +1 to index number in step visualization
fixed correct steps reordering upon context save
Fix deletion of fields from fields template view

* Minor refactoring to fix also updating of fields
Fix addition and deletion of fields inside of context view
implemented migration script for context/fields/options
Merge branch 'feature/fields_refactor' of github.com:globaleaks/GlobaLeaks into feature/fields_refactor

Conflicts:
	client/app/views/admin/fields.html
Fix deletion of steps.

Make naming more consistent
Trim labels of templates that are too long
Merge branch 'feature/fields_refactor' of github.com:globaleaks/GlobaLeaks into feature/fields_refactor

* 'feature/fields_refactor' of github.com:globaleaks/GlobaLeaks:
  implemented migration script for context/fields/options
Fix UI bug when showing few fields
Improve sorting of steps in GUI.
Fix add field typo
fixed bug spotted by hellais that caused broked references
Merge branch 'feature/fields_refactor' of github.com:globaleaks/GlobaLeaks into feature/fields_refactor
simplified tip status page controller
quite completed migration of InternalTips
Add missing step_delete view
Merge branch 'feature/fields_refactor' of github.com:globaleaks/GlobaLeaks into feature/fields_refactor

* 'feature/fields_refactor' of github.com:globaleaks/GlobaLeaks:
  quite completed migration of InternalTips
  simplified tip status page controller
  fixed bug spotted by hellais that caused broked references
Completed API for field fieldgroups/steps association
Merge branch 'feature/fields_refactor' of github.com:globaleaks/GlobaLeaks into feature/fields_refactor