Remember last share location

Fixes issue https://github.com/owncloud/android/issues/594. 

Adds an option to choose if you want to remember the last upload location from share. If the user wants to remember the last upload location, the path is stored in the shared preferences and the upload activity will start in that path. If the path no longer exists the activity will start in the parent folder. Also added an actionbar to upload activity containing the name of the current folder. 

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