Add documentation links

- Add access to each doc file
changing the name of the sample target to Recipes, which seems to irk a few people
updating the xib so that they work on iphone5 layouts with xcode 5.1
Switch back to using mainline Expecta now that it works with Xcode 5.1
Add an AppKit-style version double instead of the unmaintainable earlier solution
Don’t retain the error handler target

Fixes #428.
Add aggregate operations that support grouping by a keypath
Update fetching document
Merge pull request #520 from cbess/patch-1

Add links from the read me to all documentation
Prefix import functions with MR_ to avoid conflicts

Closes #722.
Remove unnecessary test schemes
Bump compatibility and current library version numbers to their actual values
Merge pull request #715 from govi/develop

Fix typo in the iOS sample project name and add support for 4-inch iOS devices
Modernize the iOS sample application, 'Recipes'
Restore MR_fetchController:… method to public header

Closes #674
Add MRLog updates from MagicalRecord 3.0
Honour the return value from `-(BOOL)import<#AttributeName#>:` data import methods

Closes #644, #645
*cough* wow, this is embarrassing. Fixed.
Rename `kMagicalRecordImportUnixDate13String` to `kMagicalRecordImportUnixTimeString`

You can now specify `UnixTime` as a value for `dateFormat` during imports.
Fix the tests by updating the dateFormat to "UnixTime"