Merge pull request #6 from tkruse/improvements

Improvements
Fixed typo in CATKIN-DEPENDS to CATKIN_DEPENDS and improved inline documentation
Merge pull request #10 from davetcoleman/master

Fixed typo in CATKIN-DEPENDS to CATKIN_DEPENDS and improved inline documentation
adding buildtool_depend to generated package.xml files
Merge branch 'fix-buildtool-depend' of github.com:jbohren-forks/catkinize