[MODCLUSTER-409] added VERSION method to mod_manager to return version of mod_cluster, supports both text/plain and text/xml

added protocol version
Merge pull request #84 from winfinit/MODCLUSTER-409_version_method

[MODCLUSTER-409] added VERSION method to mod_manager
Merge pull request #80 from winfinit/master

[MODCLUSTER-209] Added ability to to output text/xml for DUMP and INFO