Add suport for mimetypefinder -c file (find by file contents)
Add suport for mimetypefinder -c file (find by file contents)

qtproject/playground-mimetypes,qtproject/playground-mimetypes,d1vanov/qt4-mimetypes,qtproject/playground-mimetypes,qtproject/playground-mimetypes,qtproject/playground-mimetypes,d1vanov/qt4-mimetypes,d1vanov/qt4-mimetypes,d1vanov/qt4-mimetypes,qtproject/playground-mimetypes,qtproject/playground-mimetypes,d1vanov/qt4-mimetypes,qtproject/playground-mimetypes,qtproject/playground-mimetypes,d1vanov/qt4-mimetypes,d1vanov/qt4-mimetypes,d1vanov/qt4-mimetypes,d1vanov/qt4-mimetypes