Added Gitter badge
Merge pull request #960 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md
Revert "Add a Gitter chat badge to README.md"
Merge pull request #961 from haiwen/revert-960-gitter-badge

Revert "Add a Gitter chat badge to README.md"
Update virtual-repo.c

Removed typo
Merge pull request #966 from 1resu/patch-1

Update virtual-repo.c
[client] More graceful handling of local locked files.
[client] Fix bugs in index code.

Test case:
Have file "test.txt", folder with files "test" and empty folder "test2".
Move folder "test" into folder "test2".
Result: On the server, the folder "test" is not removed.
[client] Minor improvements to locked file handling.

* Don't load locked file set on Linux/Mac.
* Use dedicated sync error message for locked file.
[client] Update version to 4.0.4.
Remove flag kFSEventStreamCreateFlagFileEvents
[client] Fix a bug when adding file to empty dir.
[client] Fix bug in previous commit.
[Mac] Remove trailing '/' from folder path in fs events returned by system.