fix typo in apache plugin manifest
mysql: use double quotes according to version
Add version check around emitting Protocol config

The Protocol config directive only got added in version 5.4. We need to
check whether the current collectd installed meets or exceeds this
version before we output the config.

I have added two tests to check the version before and after 5.4
Merge pull request #71 from mmoll/apache_typo

fix typo in apache plugin manifest
Merge pull request #72 from mmoll/mysql_quotes

mysql: use double quotes according to version
Merge pull request #74 from tombooth/protocol-version-check

Add version check around emitting Protocol config