Display various metircs on MySQL5 and InnoDB.

Q. Why use mysql command?
A. MySQLdb may be not installed, but mysql command is installed in many cases.
Added disk read/write wait times plugin
add virtual disk devices to dstat_disk_wait
Allow specification of command line arguments via environment variable.
Merge pull request #27 from venturaville/master

Added disk read/write wait times plugin
Merge pull request #30 from Achimh3011/master

Allow specification of command line arguments via environment variable.
Merge pull request #21 from hirose31/mysql5-innodb

Display various metircs on MySQL5 and InnoDB.
author=carlhu - Update plugins/dstat_mysql5_cmds.py -- reset counters to zero.

fixes issue #28
Merge pull request #32 from trinitronx/master

Reworked patch to fix issue #28
Added --color option to force colors if python-ncurses is missing
Small fix
Merge remote-tracking branch 'upstream/master'