Created grid view fragment. #47
Finished Grid view for offers. Closes issue #47
Merge branch 'master' into dev-issue-#47

Conflicts:
	bargainhunterandroid/src/main/java/com/bargainhunter/bargainhunterandroid/ui/activities/MainActivity.java
	bargainhunterandroid/src/main/java/com/bargainhunter/bargainhunterandroid/ui/fragments/OfferListFragment.java
	bargainhunterandroid/src/main/res/values/strings.xml
Merge favorites with gridview