Merge pull request #18 from mitchellwills/hydro-devel

Adding ability to use Diagnostics Updater and self test in nodelets
Add myself as maintainer
1.8.1
Install self test executables. Fixes #16
Fix doc reference. Fixes #14
Protect tests behind CATKIN_ENABLE_TESTING.

Fixes #13
Fix private nodehandle bug
Fix linking
No more roslib
Most tests pass
Fix linking. All tests pass.

Fixes #12
1.8.2
Install selftest_rostest
Clean up stale check

Fixes #21
Fix stale aggregation bug
Add failing test for fast updater
Initialize next_time_ properly.

Fixes #20
added install rules for the common diagnostics scripts
ntp_diagnostic now publishing more frequently to avoid stale
added gitignore file