Enable Screenshots setting

Also, moved activity restart functionality to LockableActivity (needed
for recreating the whole activity when switching language or toggling
the enable screenshots setting)
Merge branch 'master' into master_feature_3247

Conflicts:
	app/src/info/guardianproject/securereaderinterface/LockableActivity.java
Use mPrefs from super class
Use latest library
Added feed to setTagFilter. If given, search whole feed, otherwise current items.
Fix 9-patch image, Bug #3397
Added feed to setTagFilter. If given, search whole feed, otherwise current items.
Merge branch 'master_task_3215' of https://github.com/N-Pex/securereader into master_task_3215
Use current feed filter from app and implement save/restore
Updated strings
Merge pull request #70 from N-Pex/master

Updated strings
Merge pull request #71 from N-Pex/master_bug_3396

Use current feed filter from app and implement save/restore
Use latest library
Merge pull request #72 from N-Pex/master_task_3215

Master task 3215
Merge branch 'master' into master_feature_3247
Merge pull request #73 from N-Pex/master_feature_3247

Master feature 3247
Latest from master