Merge pull request #374 from tmughal/master

MOBILE-2890
MOBILE-2862: Update SDK to allow support for 5.0 servers
Updated README.md
Merge pull request #375 from mikeh/master

MOBILE-2862. Updated README.md
Update linked SDK version library name. Also link to Debug library to get debug symbols on App Store builds.
Merge pull request #376 from mikeh/master

Update linked SDK version library name
Revert back to release SDK libraries - will need further thought about build process
Merge pull request #377 from mikeh/master

Revert back to release SDK libraries
Merge pull request #378 from tmughal/master

MOBILE-2897
Merge pull request #379 from tmughal/master

MOBILE-2893
MOBILE-2899: Fix NSInvalidArgumentException in - [SyncManager addNodeToSync:withCompletionBlock:], line 844
Merge pull request #380 from mikeh/master

MOBILE-2899
Sites list: Prevent a "stuck" HUD spinner when we have no session.
MOBILE-2900: Fix crash in - [SyncOperation main], line 97
MOBILE-2901: Fix crash in [AccountManager updateAccountStatusForAccount:completionBlock:] (AccountManager.m:303)
Update AlfrescoSDK to 8571d0ea8b
Merge pull request #381 from mikeh/master

MOBILE-2900. MOBILE-2901
Merge pull request #382 from tmughal/master

MOBILE-2904
Merge pull request #383 from tmughal/master

MOBILE-2902
MOBILE-2905: 2nd line of comments in tasks spills over buttons
- Also fixes an issue whereby some task attachment details were overwritten by the "No Attachments" label