v0.7.0

WARNING - enabled default r10k purge behavior for unmanaged files/folders as documented here

Please check if you need to whitelist files/folders inside your Puppet environments via purge_whitelist (r10k documentation

• add support for purge_levels and purge_whitelist and deployment_purge_whitelist (#139)
• respect prefix for -branch parameter, fixes #132
• check writability of configured CacheDir (#135) Thanks to @pillarsdotnet