Update plugins/pygments_code.rb

Making it so the build doesn't fail if a bad lexer is passed to the code highlighting.
Async load of Facebook JS

added async switch = TRUE to loader.
According to Google PageSpeed the Facebook JS was not loaded async which blocks rendering of the page as long as the JS isn't fully loaded.
Update plugins/pygments_code.rb

Giving a more helpful error message instead of silently failing.
Merge pull request #990 from sjml/patch-1

Generate can fail if Pygments can't parse a code block
Merge pull request #991 from rretsiem/patch-2

Async load of Facebook JS
Added .gitattributes file to keep CRLF's out of the codebase.
Merge branch 'master' of github.com:imathis/octopress

* 'master' of github.com:imathis/octopress:
  Update plugins/pygments_code.rb
  Async load of Facebook JS
  Update plugins/pygments_code.rb
  Upgrade ruby version
  optimized order of styles and scripts in header
  Added stringex and changed to use #to_url for create directory. To don't receive error in url to accented characters.
Merge branch 'master' of https://github.com/imathis/octopress into source