Prevent generation of very long names for lock file (cameronmaske#97)

Release 2.1.1 (cameronmaske#95)

Bump to 2.0.1, update HISTORY (cameronmaske#85)

Grjones use setnx for locking (cameronmaske#67)

* Use setnx-based lock to avoid race conditions

Merge pull request cameronmaske#29 from TrackMaven/0.1.4

Release 0.1.4

Merge pull request cameronmaske#3 from TrackMaven/readme-fixes

Minor typo fixes in README.rst