v0.2.0  --  2014.04.27
* Move main module from lib/duration.js to index.js
* Remove Makefile (it's cross environment package)
* Update to use latest versions of dependencies

v0.1.4  --  2013.01.03
* Threshold option for default toString modes

v0.1.3  --  2013.01.02
* Fix documentation of npm install command

v0.1.2  --  2012.11.10
* Fix handling of negative durations (when to is older than from)

v0.1.1  --  2012.10.04
Maintanance
* Rename lib/index.js to lib/duration.js
* Lint cleanup
* Upgrade es5-ext

v0.1.0  --  2012.05.28
* Initial version (derived from es5-ext project)
