OR-701 GET endpoint to retrieve the CalDAV server url for the client
OR-701 Add unit and midway tests
OR-751 Use in-directive slicing intead of filter
OR-751 remove inSlicesOf filter

This is a really sad move, because the filter approach was way more elegant.
However, because Angular uses strict equality comparison, and we return arrays,
we are not able to bring a working filter without a global cache.

And the global cache brings infinite digest cycles error when we instanciate
several directives using the inSlicesOf filter.
OR-751 fix: remove event leak in communityMembersWidget directive
Merge pull request #521 in OR/rse from ~MBAILLY/rse:OR-751 to master

* commit '04d2cbb1b0c1ddc8c545787b0c0ffa455aacda03':
  OR-751 fix: remove event leak in communityMembersWidget directive
  OR-751 remove inSlicesOf filter
  OR-751 Use in-directive slicing intead of filter
Merge pull request #533 in OR/rse from ~RPIGNOLET/rse:OR-701 to master

* commit '87cb69247f1d9610932fa7f374c508e3e5d48092':
  OR-701 Add unit and midway tests
  OR-701 GET endpoint to retrieve the CalDAV server url for the client