add override_mysql_grant_ips function to temp override ip's for granting privs
add documentation for override_mysql_grant_ips
add example for override_mysql_grant_ips
Merge pull request #4 from tumblr/override_mysql_grant_ips

add override_mysql_grant_ips function to temp override ip's for granting privs
Merge branch 'master' of github.com:tumblr/jetpants