adds many tests, updates the readme and docs
helpers: comparison: add `ifNth` helper

Basically a modulo, useful inside #each with @index.
Merge pull request #108 from eins78/master

helpers: comparison: add `ifNth` helper
Merge pull request #107 from nlfurniss/master

Adds New Tests
adds two more tests, update docs
Merge pull request #109 from nlfurniss/master

two more tests for good measure
fixing jshint errors
adding a test for ifNth
removing console.log from ifNth
bumping bower.json
0.5.2
Merge branch 'master' of https://github.com/assemble/handlebars-helpers

Maintaining branch updated with official library