Correcting Russian unit test example.

fixing package.json typo

Fixing incorrect version.

v2.5.1: added start of unit tests to verify addToDate; reversed order…

… of applying fields to match result from other direction

v2.5.0: adding ability to accept a timespan as an input as well as ad…

…d a timespan to a date; fixes #16

fixing documentation

v2.4.1: Enabling customization of delimiter and last unit prefix; fixes 

#4

v2.4.0: using viewer time zone for all calculations; fixes #8

Fixes consistency issue when viewer time zone offset pushes either start or end into a different month.
Humans expect to see ambiguous concepts like number of months from their local time not UTC.

adding bower support; closes #6

adding bower support; closes #6