Optimized the ConversationsFragment

It now takes a conversation, reduce the number of queries.
Merge branch 'master' of https://github.com/inez/stuff

Conflicts:
	stuffapp/src/com/stuff/stuffapp/fragments/DetailsFragment.java
Merge branch 'master' of https://github.com/inez/stuff

Conflicts:
	stuffapp/src/com/stuff/stuffapp/fragments/DetailsFragment.java