Fix a `url` and `checksum` property on datastream versions.
Fix error message.
Merge pull request #73 from adam-vessey/1.x-fix-version-properties

Fix `url` and `checksum` properties on datastream versions.
less lying in query docs and params
Merge pull request #74 from willtp87/1.x.query

less lying in query docs and params
Truncate labels so Fedora doesn't blow up.
Use mb_substr if it exists, fallback to substr otherwise.
Add a test.
Let's do it for Datastreams as well.
Call real string functions, handle modifying too.
Merge pull request #76 from jordandukart/1.x-label-length

1.x label length