Update README with clearer LIKE predicate examples

LIKE in Core Data takes "*" or "?" as per http://stackoverflow.com/questions/2740933/nspredicate-that-is-the-equivalent-of-sqls-like, not %
LIKE interpolation doesn't require quotes
Added #attributes method to CDQManagedObject
Added normal reader attributes example to README
Use class name when inside of a module. Fixes #50
Added length method

This brings it closer to ActiveRecord which can do count/size/length, and also allows users to easily move from array.length to a coredata object.length
Also added size - like ActiveRecord has it
Added test for count aliases
adding aliases to here as well
completed tests for aliases
Merge pull request #44 from paulca/patch-1

Update README with clearer LIKE predicate examples
Merge pull request #46 from jamonholmgren/master

Added #attributes method to CDQManagedObject
Merge pull request #51 from jonmorehouse/master

Use class name when inside of a module. Fixes #50
Update README.md
Merge pull request #53 from GantMan/master

Allow `size` and `length` on CDQ objects - Like ActiveRecord
Add attributes by name method to managed object.
Merge pull request #57 from willrax/master

Add attribute_names method to managed object.
fixing the way cdq.yml specifies the data model name in conjunction with ruby-xcdm
Clarify the readme doc
Merge pull request #62 from HYR/master

Clarify the readme doc