Merge pull request #7 from zolrath/master

Add frequencies method
Update README.md
Add new methods to objects, collections and dictionaries

* tap - Calls the function with the object, and then returns object
* pick - Returns a new dictionary only with choosen keys
* omit - Returns a new dictionary without omited keys
* merge - Returns a new Dictionary with merged values
* keys - Returns an array instead of MapCollectionView
* values - Returns an array instead of MapCollectionView
Update README with new functions
Fix .xcodeproj adding CarExample
Change .merge to accept variable number of arguments
Merge pull request #10 from bastos/add-new-functions

Add new methods to objects, collections and dictionaries
Adding initial code and test for chaining. TODO bugs to fix
Fixing typo
Using class instead of struct as struct return by value rather causing issues with mutablity
Merge pull request #11 from ankurp/chaining

Adding initial code and test for chaining. TODO add more chained methods.
Update README.md
Update Dollar.podspec
Update README.md
Updating docs
Updating docs
Update README.md
Update README.md
Update README.md
Update README.md