* cover caching overhaul
* add ui for removing custom cover
* skip some loading work
* minor cleanup
* allow refresh library metadata to refresh local manga
* rename metadata_date to cover_last_modified
* rearrange removeMangaFromLibrary
* change custom cover directory
add setting for updating cover when refreshing library
* remove toggle and explicit action for updating covers
* Saving to SD working
* Rename imagePath to uri
* Handle android < 21
* Minor changes
* Separate downloader from the manager. Optimize folder lookups
* Persist downloads across restarts
* Fix for #511
* Updated ReactiveNetwork. Add some documentation
* More documentation and minor fixes
* Handle persistent notifications. Other minor changes
* Improve downloader and add documentation
* Rename pageNumber to index in Page class
* Remove unused methods
* Use chop method
* Make sure dest dir is created
* Reset downloads dir preference
* Use invalidate options menu in download fragment and fix wrong condition
* Fix empty download queue after application restart
* Use addAll method in download queue to avoid too many notifications
* Inform download manager changes
Forgot to add IOHandler
Removed FAB library now use the internal one. Changed getTimestamp to modification date.
Rewrote IOHandler. Fixed Drive Bug. More bug fixes. Tested working for API 16 and 23
Fixed merge bugs
Fixed some mistakes.
Code optimization. Added comments. Few comment mistake fixes
Few comments
Added classes because of renaming
Fixed refactor mistakes :(.
typo + removed todo empty class
Changed o to 0. Some renaming. Checked for nullability on string.isEmpty() function to prevent crashes
Removed redundant null check
Update ChapterCache.java
Another o to 0 change. Damn this .o! :)
