bump version

bump version

bump to 0.3.13

v0.3.11 release

bump version number to 0.3.9

Merge pull request #42 from TwP/master

Check if the file descriptor really exists

Merge pull request #38 from tnm/patch-1

Version bump to 0.3.7 for Windows backtick fix

Version bump: 0.3.6 (jruby support + skip cext on win32)