explicit-svn-url expects incorrect param

[isucan]

I run this command:

'git bloom-import-upstream --explicit-svn-url https://alufr-ros-pkg.googlecode.com/svn/branches/octomap_stacks-groovy-devel/octomap_msgs'

I get this error:
'--explicit-svn-version' must be specified with '--explicit-svn-url'

(I think it is not the case for an error when a package.xml exists at the specified url, which is the case here)
I then specify the suggested argument:

'git bloom-import-upstream --explicit-svn-url https://alufr-ros-pkg.googlecode.com/svn/branches/octomap_stacks-groovy-devel/octomap_msgs --explicit-svn-version 0.2.4'

and I get:

usage: git-bloom-import-upstream [-h] [-i] [-r]
[--upstream-devel UPSTREAM_DEVEL]
[--upstream-tag UPSTREAM_TAG]
[--explicit-svn-url EXPLICIT_SVN_URL]
[--upstream-version UPSTREAM_VERSION] [-d]
[--version]
git-bloom-import-upstream: error: unrecognized arguments: --explicit-svn-version 0.2.4

Using --upstream-version instead of --explicit-svn-version worked, but this is a bit confusing.

[wjwwood]

Fixed the message it returns in 9230c9a.

I want to restructure git-bloom-import-upstream to make it simpler, I might do that in the next version of bloom.