Added FIXME
Added "extend" attribute to <rbs-document-list/> to extend it. Document pickers now use this instead of the "picker" attribute, which does not exist anymore.
Enhanced Document Picker:
- template is loading without ngInclude and an error is correctly displayed when the template could not been loaded.
- templates are simplified: you only have to define the <rbs-document-list/> (header and buttons are now part of the picker).
- added buttons to add/replace the selection with the selected documents.
Merge pull request #248 from fredericbonjour/Admin

Enhancements in Document pickers (and <rbs-document-list/>).