init-rtags: customizable source file extensions
init-rtags: customizable source file extensions

exordium-rtags-source-file-extensions defiles the list of source file
extensions that command M-x rtags-create-compilation-database uses to
search for files. The default list is ("*.cpp" "*.c"). This makes this
command also work with C projects by default.

psipika/exordium,philippe-grenet/exordium,steve-downey/dot.emacs,pkryger/exordium,fcassirer/dot.emacs,jbibollet/exordium