Check the version number taking into account the new format
Check the version number instead of the version string
Save version with two dots, for the comparison with MINIMUM_VERSION_FOR_SHARING_API
Grant comparison between versions of 4 parts and version of less than 4 parts will be right in any possible situation
Update MINIMUM_VERSION_FOR_SHARING_API
Merge pull request #20 from owncloud/check_server_version

Updated representation of server version