Readme markdown cleanup.
Try to load graphital.conf from a few different places.
Example conf file now has a .eg suffix (but will still be
loaded if nothing else is found). Updated readme to reflect change.
Added info to readme about running via Upstart for Ubuntu/Fedora.
Merge pull request #1 from chrisberkhout/master

markdown cleanup, check different locations for config, notes on running as upstart service