Update phpMyAdmin.conf.erb

Warning: Variable access via 'doc_path' is deprecated. Use '@doc_path' instead.
Update phpMyAdmin.conf.erb

Warning: Variable access via 'ip_access_ranges' is deprecated. Use '@ip_access_ranges' instead.
Update config_header.inc.php.erb

Warning: Variable access via 'blowfish_key' is deprecated. Use '@blowfish_key' instead.
Warning: Variable access via 'properties_iconic' is deprecated. Use '@properties_iconic' instead.
Merge pull request #16 from damusnet/patch-1

Update deprecated variable access