Update to Font Awesome 3.2.1

Font awesome 3.2 added a further 58 icons in release 3.2 and implemented some further fixed in version 3.2.1

[v3.2.0 GitHub milestones](https://github.com/FortAwesome/Font-Awesome/issues?milestone=3&page=1&state=closed)
[v3.2.1 GitHub milestones](https://github.com/FortAwesome/Font-Awesome/issues?milestone=5&page=1&state=closed)

** Change summary:**

* Updated all font and css assets to Font Awesome version 3.2.1
* Added a .gitignore for OSX .DS_Store
* Updated the PDF CheatSheet to version 3.2.1
* Updated the build/icons.yml to version 3.2.1
* Bumped the wordpress plugin version to 3.2.1
* Updated the README where relevant and included v3.2.1 release notes

FYI - Previous pull request contained a markdown error in the README which I've since corrected. Hence the resubmit.