Fixed catkinize script to work on single packages

The catkinize script got changed (erroneously) a few versions back and was trying to work on stacks, so this fixes it to work with single packages again.
Merge branch 'master' of https://github.com/MattDerry/catkinize
hack to get maintainer emails
automatically handle everything related to messages - listing messages present in add_message_files and including the message_generation and message_runtime dependencies
also do services and actions
fixup! also do services and actions
deal with std_msgs now needing to be added as a dependency