Fixes for MySQL collector
don't send duplicate metrics when using publish options
fix the innodb options
suggest process privileges instead of super
Remove unnecessary loop
Adds in example SHOW ENGINE INNODB STATUS output, re #251
SHOW INNODB STATUS requires SUPER privilege on MySQL version < 5.1.24. On version 5.1.24+ only PROCESS is required
Merge pull request #250 from tommyulfsparre/fix-mysql-collector

Fix mysql collector
Add in new test proc_diskstats
Merge branch 'master' of github.com:BrightcoveOS/Diamond
Fix #253, this setup options to control the max backlog and how far to trim the list once we match. We store the last set of metrics when trimming.
Pep8
Fix mysql.py
Fix xen tests