Pilon version 1.22

This is a very minor release incorporating two bug fixes reported by users:

1. Fixed bug in .bed file coordinates generated by the --tracks option (start coordinate was 1-based rather than 0-based);
2. More flexibility in --target specifications is now allowed so that scaffold names may contain colons (apparently Quiver generates these). Thanks to bwlang for sample code!

There should be no changes to results in this version other than the above.

--bruce, 15 Mar 2017