Merge pull request #424 from wmathurin/unstable

Reloading table data from the main thread
Setting "Skip Install" to YES for OAuth
Merge pull request #425 from khawkins/oauth_skip_install

Setting "Skip Install" to YES for OAuth
Merge remote-tracking branch 'upstream/master' into unstable
Merge pull request #426 from khawkins/unstable

Mobile SDK: Merging master into unstable
Merge pull request #427 from wmathurin/unstable

Cell showing wrong image bug fix
Merge pull request #428 from wmathurin/unstable

Cleaning up network engine on logout
Merge pull request #429 from wmathurin/unstable

Exposing underlying SFNetworkOperation as property and on send