update buildToolsVersion
update rxMarkDown
update support libs
remove this, because it seems not to be needed (?)
```
- compile 'io.reactivex:rxandroid:1.2.0'
- compile 'io.reactivex:rxjava:1.1.5'
```
* Improved presentation of errors if login (SettingsActivity) or synchronization fails.
* Show icon if a note is not synchronized (hint to a possible error)
* Refactoring: move common code to new private method getNotesRawQuery(String sql, String[] selectionArgs)
New method getLocalModifiedNotes() is a preparation for bugfixing #117
* last part from the previous refactoring
* use material design icon and remove old holo icon
* Refactoring NoteSQLiteOpenHelper and NoteServerSyncHelper in order to fix several bugs belonging concurrency and synchronization. Outstanding: documentation, testing, cosmetic changes
* Show icon if a note is not synchronized (hint to a possible error)
* Refactoring: move common code to new private method getNotesRawQuery(String sql, String[] selectionArgs)
New method getLocalModifiedNotes() is a preparation for bugfixing #117
* last part from the previous refactoring
* use material design icon and remove old holo icon
* Refactoring NoteSQLiteOpenHelper and NoteServerSyncHelper in order to fix several bugs belonging concurrency and synchronization. Outstanding: documentation, testing, cosmetic changes
* only pull remote changes if this was demanded by the caller
* restructure the communication between synchronization task and user interface using callbacks, only try to sync if not offline, otherwise show an error message.
* updateNoteAndSync(): only make database changes, if the content really changed (see #104)
* javadoc and cleanup
* Bugfix for EditNoteActivity: invoke callbacks directly if note wasn't changed in edit (before, callback was never invoked in this case)
* Make sure, that saveDataWithUI is not called, when the previous saveAndSync is still running. In addition, start next saveAndSync not before a small delay has passed.
* rename auto-sync method; adjust DELAYs
* Quick Bugfix: Toast in AsyncTask have to be in onPostExecute
* Bugfix: save edited note in offline mode, too
* Bugfix: Show error message in UI thread
* reduce writes to local storage
* reduce logging
* Refactor: remove recurrent code
* UI enhancement when editing notes (with no changes)
Solved by just downloading new notes onResume and add them dynamically to the adapter. Manual pull2refresh will still cause this behaviour which is imho fine since a user has to be at the top position to trigger this action.
