Restore access to the deprecated API method signatures

* Declares previous API as deprecated with helpful message pointing to the new API
* Adds unit tests for the deprecated interface
Merge pull request #3 from blakewatters/feature/deprecated-api-support

Restore access to the deprecated API method signatures
Correct error message.
Update example in README

The previous example was using methods that have been deprecated in favour of a new API that improves error reporting.
Remove documentation instructions from podspec.

CocoaPods has removed appledoc support in favour of CocoaDocs.
Bump version number.
Set version for source.
Fix documentation error for `relativeStringWithVariables:error:`
Add `NSURL` integration and tests

* Cleanup documentation a bit
Merge pull request #5 from blakewatters/feature/url-integration

Adds basic NSURL Integration