Update the sass compiler, introduce Composer.

Closes #153, closes #151
Drop SASS support (not SCSS).
Update changelog for 0.2.1 release.
Update changelog release date
Add points to changelog
Remove old webserver fixes
Update composer generated autoloaders.
Add synonym functions
Keep all key types.
Upgrade FontAwesome to v4
Tidy up PATH constant
Fix clashing PageCode names
Fix clashing PageCodes with Classes
Remove debug statement
Allow passing multiple param arrays.
Allow empty documents
Update order of head elements
Add otf font
Remove vendor's gitignore
Remove obsolete files from Classic API