Merge pull request #1 from martinaLopez/master

Added selection of random words and definitions.
Refactor, added debug mode and cycling over letters.
Uploaded dictionary files.
Added updated dictionary.
The Application now loads all the words and definitions to a map(to allow the application to be restored) instead of accesing the DB when passing to the next word(See CreateGameAsync on MainActivity).
A progress Dialog is shown at the start of the application(when loading the words).
Class Word has a new attribute(active_def), this attribute is the random definition.