Edited for clarity

Edited "Limitations" and "Compatibility" sections for English clarity and grammar.
Warning for unknown host exception (support info)
Ignore illegal state exception (support info)
Make Gmail provider optional (support info)
Check content provider query parameter type (support info)

Some app passed android.database.sqlite.SQLiteDatabase
Fix null pointer (support info)
Fix class cast exception (support info)
Do not show accounts/applications/contacts when activity is finishing (support info)
Polish translation updated
Prevent writing usage data while database is locked by reader (support info)
Merge pull request #1277 from skibbipl/patch-29

Updated Polish translation
Updated changelog
Update README.md

Notes: when a sentence contains the agent and object of a transitive verb, clarity and directness of expression prefer the active voice over the passive. Similarly (though less seriously), the modal verb "will" is deadwood because, in this context, there's no difference between what stating what XPrivacy does and what XPrivacy will do.
Redesigned on demand dialog (untested)
Fix divide by zero (support info)
edited installation, upgrading, and usage sections

Note: when an English sentence contains the agent and object for a verb, clarity and directness of expression require the active voice over the passive. Also, the modal verb "will" is frequently deadwood. In the present context, there's no difference in meaning between "XPrivacy will <do sth.>" and "XPrivacy <does sth.>."
Updated to do
Merge pull request #1278 from Jimmy34742/patch-1

Patch 1
Small clarification in the readme
Merge pull request #1276 from Jimmy34742/patch-3

Edited for clarity