support for ref links

fixes https://github.com/lacarmen/cryogen/issues/39
bumped up markdown-clj version
fixed sass paths
added System/exit in the main
formatting
bumped up version
bumped up markdown-clj version
Merge branch 'master' of https://github.com/lacarmen/cryogen-core

Conflicts:
	project.clj
removed main
bumped up selmer version
Support :ignored-file config key

Prevent the compiler attempting to process files defined by a list of
regexps. By default ignore emacs and vi backup files.
Merge pull request #4 from j0ni/ignore-backup-files

Support :ignored-file config key
Fixed versioning