Removed "IF NOT EXISTS" checks, because MySQL does not support them
Removed "IF NOT EXISTS" checks, because MySQL does not support them

Tested with MySQL 5.5.46-0ubuntu0.14.04.2 (Ubuntu), see also
http://dba.stackexchange.com/questions/24531/mysql-create-index-if-not-exists
jeffmcaffer/github-mirror,pombredanne/github-mirror,gousiosg/github-mirror,jeffmcaffer/github-mirror,gousiosg/github-mirror,pombredanne/github-mirror