started to split validation into the model layer where it belongs
switched back to using StringExtensions.h for trim
Refactored doSubscribe for issue #315
corrected the parameter name in the header so it matches the implementation
changed from Class method to an instance method for verifiedURL
made rssFeedURL autorelease
refresh local file subscription after creating
fixed rebuilding a URL with a feedPart string
fixed handling of URLs using a feedPart
Correct memory issues
Fix subscription relative URL strings

As reported by Colin Devroe on Twitter : https://twitter.com/cdevroe/status/517764395183915009 and https://twitter.com/cdevroe/status/517764086478958593
Comments for future developments
More rigorous testing of URL strings
Merge pull request #2 from barijaona/issue-315

improvements on the fix for issue-315
Merge pull request #339 from josh64x2/issue-315

Fixes for new subscriptions