Added nav drawer system
Added new style & set of icons
Fixed conflict
Merging with master
Imported MainActivity from master
Converted activities into fragments, cleaned some code
Handle TaskActivity launching
Imported code from master
Updated code
Binded categories list, fixed bugs
Converted activities to actionBarActivities
Added addTask & addCategory buttons on custom menus
Cleaned code & removed warnings
Cleaned code
Updated color.xml & designed tasklist rows
Fixed conflict
Cleaned code again
Merge branch 'sidebar-api8'

Conflicts:
	AndroidManifest.xml
	res/layout/activity_add_category.xml
	res/layout/activity_categorylist.xml
	res/layout/activity_main.xml
	res/menu/categories_list.xml
	res/values/strings.xml
	src/fr/esgi/toutdouxapp/AddCategoryActivity.java
	src/fr/esgi/toutdouxapp/AddTaskActivity.java
	src/fr/esgi/toutdouxapp/MainActivity.java
	src/fr/esgi/toutdouxapp/TaskActivity.java
	src/fr/esgi/toutdouxapp/db/TasksDataSource.java