support OS_FAMILY and OS_VERSION_REGEX for jclouds
add function for converting to string, and use that for the "cpu fraction" sensor
correct message about ctrl-c to shutdown because if running in background that does not work!
comments on BrooklynNode
more tests and minor fixes for double-string methods, as per code review
Merge pull request #1414 from ahgittin/misc

a few minor fixes/tweaks, including OS_FAMILY support in yaml