don't automatically retry on NSError in UAHTTPRequestEngine
Update table schema.
Reset database on new content
Merge pull request #269 from urbanairship/FixDatabase

Fix the inbox database
modify UAUserAPIClient with request error retries
Merge remote-tracking branch 'origin/LIB-807'
Bump version to 2.0.4
Update changelog
Add new line between changelog releases
Merge pull request #271 from urbanairship/Release2.0.4

Release 2.0.4