update REP 3 for hydro and updated rules for target platforms
Merge pull request #26 from dirk-thomas/master

update REP 3 for hydro and updated rules for target platforms
missing newline
phrasing
more explicit on the topic of mixing changlog and other content in the same file (README.rst)
removed the idea of seraching more than one location, in particulr README.rst.
Not encouraging usage of other elements in the Changelog file.
rosbuild concern
Merge pull request #29 from tkruse/repchangelog

More text on the use of README.rst with embedded Changelog