Rename "description" property to "helpDescription"

When attempting to build against at least the OSX 10.10 SDK, the `description` property on `BRLOption` was clashing with `description` on `NSObject`, which is `readonly`, so Xcode 6.1 throws a warning and doesn't autosynthesize `setDescription:`, leading to runtime crashes.  This pull request renames the property and bumps the patch version number of the podspec.

I have been unable to get the Kiwi tests to run (various similar issues with `description` in Kiwi if I run under Xcode 6.1; issues with ARC if I run under Xcode 6.0 or 5.1.1), so I haven't been able to run the tests.