Added an Jekyll Importer for Ghost
Added documentation for Ghost
Removed the copied comment in Ghost importer to prevent confusion
Ghost Importers dbfile option now has a default => ghost.db
Revamped the Ghost Importer completely
Ghost Importer: The way the filename is generated is easier to read now
The --dbfile option doesn't need to be mandatory, cause there is a default
Merge pull request #100 from gr4y/master