Added a configurable max number of saved tweets
Merge https://github.com/paletas/YambaPDM_2013
Merge https://github.com/paletas/YambaPDM_2013
Timeline now limits the tweets according to the preferences
Translated to PT
Merge https://github.com/paletas/YambaPDM_2013

Conflicts:
	src/pt/isel/pdm/yamba/views/YambaBaseActivity.java