Bumped Version Number, Updated config.yaml, Briefly Tested with MT 4.38 and 5.2.2,

Bumped UnrecognizedTags to version 0.7.  Added links to Six Apart
website and to the movabletype/mt-plugin-unrecognized-tags repository
in Github to config.yaml.  Installed and briefly tested
UnrecognizedTags with MT 4.38 and 5.2.2.  Both displayed the message
"No unrecognized template tags could be found" as expected.