Update libsass to v3.0 and Coda to v2.5 plus more

* Upgrade libsass to v3.0
* Move the minimum version of Coda to 2.5 so that we no longer have to
  use private notifications in order to know when a file has been saved
* Upgrade the Bourbon Neat embeded library to v1.7
* Upgrade Foundation embded library to v5.4.6
* Added normalize v3.0.2 as a embeded library