Started iCloud stack
Some changes
Minor changes
Updated podfile
More changes
Added iCloud stack
Added defensive code to avoid operations if the contexts are not initialized
Added flag of StackInitialized
Added observers to detect changes in the ubiquituous container
Modified the root saving context merge policy for iCloud stack
Some polish and cleaning
Added some tests
Added mor tests
Finished tests of iCloud stack
Fixed travis scripts
Updated git submodules
Some changes in documentation and fixed travis script(again)
Merge pull request #45 from SugarRecord/feature/iCloud

Started iCloud stack