`semver.clean()` strips off the build metadata, so without this change I see `resolved git://github.com/trask/flot.git#0.8.1` instead of `resolved git://github.com/trask/flot.git#0.8.1+patch.1` when I run bower, e.g.

    bower flot#0.8.1+patch.1    not-cached git://github.com/trask/flot.git#0.8.1+patch.1
    bower flot#0.8.1+patch.1       resolve git://github.com/trask/flot.git#0.8.1+patch.1
    bower flot#0.8.1+patch.1      download https://github.com/trask/flot/archive/0.8.1+patch.1.tar.gz
    ...
    bower flot#0.8.1+patch.1      resolved git://github.com/trask/flot.git#0.8.1