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New features
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* **p4:** switch to disposable workspaces
* **p4:** add multiple VCS roots support
* **poll:** add perforce server polling to trigger builds by opening specified URL
* **tests:** add test stub
* **tests:** switch to py.test
Bug fixes
~~~~~~~~~
* **p4:** fix argument processing & list sorting
* **p4:** add p4client name changing
* **tests:** fix configs.py
* **tests:** add missing thirdparty dependency - module 'py'