add changelogs
update readme to say Hydro and mark that catkinization is done
manually merge #53, revive catkinized rosserial_xbee
add changelog for rosserial_xbee
make installable
Merge pull request #55 from PaulBouchier/hydro-devel

Hydro devel
- empty service request fix
- add checksum to length
- add protocol version in messages and check it
Update CHANGELOG.rst files for 0.5.0 release