Move MySQL configuration to a separate file
Remove PHP closing tags - these can cause issues with headers
Add sample MySQL config file
Use PDO instead of mysql_
Refer to the class and not to 'self' for readability
Handle non-existent server for heartbeat updates
Fix grammar
Get rid of useless comments - comments should explain things that the code doesn't or can't
Formatting and readability fixes
Clean up and reformat code, and get rid of trailing whitespace checks
Merge branch 'fix'