add WatchEvent and WatchEventListener in order to notify following events :
- INDEXING, DOWNLOADING, UPLOADING
comment update
Merge branch 'master' into fix-watch-notif
Merge branch 'master' into fix-watch-notif

Conflicts:
	syncany-lib/src/main/java/org/syncany/operations/DownOperation.java
Merge branch 'master' into fix-watch-notif
Merge branch 'master' into fix-watch-notif
Merge branch 'master' into fix-watch-notif
deduper update
Merge branch 'master' into fix-watch-notif

Conflicts:
	syncany-lib/src/main/java/org/syncany/Client.java
Trying to fix issue #58, no success
Attempting ot resolve issue #58, still no success; but getting closer; CleanupMergeDatabaseFilesScenarioTest / testIssue58_2 produces a very similar problem
Cont'd debugging #58, no success :-/
Cont'd testing for issue #58
Cont'd #58, no success; leaving it here for now.
Fixes #72 (Deleting folder leads to ChangeFileSystemAction instead of DeleteFileSystemAction)
Write test for folder permission issue (already fixed by #72); closes #71
Trying to reproduce #58; Added DebugCommand; reproduces MULTICHUNK_CHUNK constraint exception
Trying to reproduce #58; Added DebugCommand; reproduces MULTICHUNK_CHUNK constraint exception
Merge fix-issue-58 branch into issue-58
Merge branch 'master' into fix-watch-notif

Conflicts:
	syncany-lib/src/main/java/org/syncany/operations/DownOperation.java
	syncany-lib/src/main/java/org/syncany/operations/Indexer.java