Dependency Update

The denpendency check for nokogiri was updated to allow all versions of nokogiri greater than 1.5.10 as the version bundled with vagrant is currently 1.6.x.
Major version dependancy for Nokogiri

Switched from accepting all later versions of Nokogiri to all 1.x versions.
Typo correction
Bump version: 0.13.0 → 0.13.1
Merge branch 'SAITRADLab-master'
Updates README.md