Added pivotal tracker support, leveraging csv2youtrack.py

Had loved using Pivotal Tracker, but was looking to move into more enterprise solutions. YouTrack was the way to go, but I needed to get the data out of PT. 

Full support for PivotalTracker via csv interface. See pivotalTracker2youtrack.py for the main content and description. Tested actual imports, and will put in tag support as well once http://youtrack.jetbrains.com/issue/JT-25499 has been resolved. 

Does a pre-processing on PT exports, and runs on the file processed. Additionally, modified csv2youtrack to have the mapper a bit more dynamic for clients if then want to call run directly, as well as created deleteIssue, which was useful for testing. 
![evidence_pt](https://cloud.githubusercontent.com/assets/80143/3488216/41147fb2-04d4-11e4-870e-f6ad44c3bac0.png)