Adds a +dictionaryFromQueryString as a counterpart to the -queryString

- This method gives back a dictionary of strings from the passed in query string.
- un-freezes the podspec and bumps it to 0.1.0
- Adds CHANGES.markdown to track what is being modified
Merge pull request #66 from pivotalshiny/dictionaryFromQueryString

Adds a +dictionaryFromQueryString as a counterpart to the -queryString