First version of the comic viewer on git.

Just shows a bunch of files from the res directory.
Read CBZ files
Añadidas animaciones en sentido contratio
Añadido explorador de archivos (aún no conectado)
Añadido lector de CBR
The file explorer is connected to the activity
The Activity saves its state
Load scaled images to avoid OutOfMemory errors

As a result, Reader is now a class and not an interface
A different image scale strategy to improve quality
TransitionView is no longer in use: the ComicViewerActivty does all the
logic of the application.
Next pages are loaded in the background
The explorer is the main activity
Uses a cool collection manager
Amended commit that includes some previosly untracked files.
Introduced a new reader: imges directory

Load pages in low resolution
Use a SQLite database to store information about the comics
Remember the last visited page

First steps of a bookmarks system
Include a directory selection activity.
Manual rescan of the collections.
Solves a bug in the last page of the comics.
Ask the comic directory at the beginning and save preferences
Set and unset bookmarks
Spanish localization
Saves the state of the current comic onDestroy(), not onStop().
Solves a minor bug in the creation of names for covers.
New activity: Bookmark list
Solve minor bugs
Move to the next issue at the end of a comic
Fixes a minor bug in the bookmarks list of a comic
Contextual menu on items: remove comics
Some minor fixes: animations to the left