Added guide for installing underscore.string library to a yeogurt project
Added pure.css, animate.css, and underscore.string installation guides
Updated roadmap
Updated all guides to use `--save` on bower installation
Added guide on installing Underscore
Updated Changelog
Merge branch 'release/v0.11.7' into develop

* release/v0.11.7:
  Updated Changelog
  Updated all guides to use `--save` on bower installation Added guide on installing Underscore