Merge pull request #426 from khawkins/unstable

Mobile SDK: Merging master into unstable
Returning underlying SFNetworkOperation on send (for parity with Android)
Cell showing wrong image bug fix
Using [fileId hash] for the image view tag
Merge pull request #427 from wmathurin/unstable

Cell showing wrong image bug fix
Cleaning up network engine on logout
Exposing internal SFNetworkOperation as property
Merge branch 'netlib' of github.com:wmathurin/SalesforceMobileSDK-iOS into unstable
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
3PP submodule update, adding token revocation back to logout
Fixing thread safety issue with rkClient in SFRestAPI
Merge pull request #434 from khawkins/204_patch

2.0.4 patch
Merge remote-tracking branch 'upstream/master' into unstable

Conflicts:
	external/ThirdPartyDependencies
	native/SalesforceNativeSDK/SalesforceNativeSDK/Classes/SFRestAPI.m