Merge pull request #409 from wmathurin/netlib

Switching from RestKit to SalesforceNetworkSDK/MKNetworkKit
Small changes suggested by reviewers
Small changes suggested by reviewers
Native template app now has SFRestAPI+Files.h header
Merge pull request #417 from wmathurin/netlib

Files wrappers + Tests
Merge branch 'netlib' of github.com:wmathurin/SalesforceMobileSDK-iOS into hybridfileexplorer