Merge pull request #15 from pkyeck/master

add izString validator and tests
Adding string validation

Also fixed a syntax issue with example code.
Make fields a public variable
Get all fields with errors
Added docs for getInvalidFields
Bumped version number, fixed test runner for node 0.10
Updated change log for 0.4.0
Split tasks into their own files
Moved dist to amd and split files
Added issues URL
Bumped to 0.4.1
fix typo in readme