Only create on fragment per tab instead of recreating it all the time.
Contexts tab working.
Initial steps in "correct" activity - fragment communication
Getting there
Next step
Next step
Done refactor of filter tabs. Fixes fragment leaks
Remove left over google API stuff
Stop hammering dropbox on view recreation
Display string search filter in filterbar
Allow shortcut format to be changed without breaking old shortcuts
Remover magic strings
Condense filter lists for easier overview
Redid task add activity
Some more cosmetic tweaks
Add option to clear filter
Merged from refactor

Conflicts:
	src/nl/mpcjanssen/todotxtholo/FilterActivity.java