Add .gitignore file with ignored android files
Init project with blank page
Add Eclipse files
Add general mecanism of application
Add resource files
Update AndroidManifest file
Add copyright and license header
Change the name of getNbQuestion() of Plugin interface
Add navigation
Add label to level/subject/topic definition
Add explanation screen to module screen
Change question layout and add several exercises to database
Add plugins file
Remove the old ExplanationActivity in AndroidManifest and update the methods to the last version of Plugin API.
Fix bug: add version field in topic table in database