Issue 50: vClock now gets read from object if not present in input, making vclock easier to work with.
Issue 54: Conflict resolver can now be set on a bucket or passed along to the get function, which can make conflict resolving a lot easier.
Issue 10: Automatic retry implemented and set to 1 retry by default
Issue 55: Implemented missing getter for last modified on object.
Additional method: Set and get stroke dash array (on GmagickDraw)
Update version checks for method availability
Updated existing tests and added new test