add option to pass specific version to catkin_prepare_release

[dirk-thomas]

The new option allows to specify arbitrary versions in case bumping major/minor/patch isn't sufficient.

[sloretz]

I tested up to where it wants to push to the remote repo with and without --version specified. Does anything after catkin_prepare_release force a major.minor.patch format for the version? The script will happily accept any string at the moment.

[dirk-thomas]

Does anything after catkin_prepare_release force a major.minor.patch format for the version? The script will happily accept any string at the moment.

Correct, no enforcement. The caller is in charge of its own fate 😉

[dirk-thomas]

In expectation of the "worst" I added the same regex check from catkin_pkg: 65dc6fb

[sloretz]

65dc6fb works for me. It would be more DRY to add and import a check_version function from catkin_pkg.package_version, but as it's just one line I'm fine with it as it.