Add Hdfs.fromOption
Merge pull request #1 from ambiata/topic/add-from-option

Add Hdfs.fromOption
updated mundane
fixed the Hdfs store specification
removed the html generation from ci
Merge commit '7d5f35d'
using the latest mundane and made list return relative paths
fixed the mirror examples
added a root val on HdfsStore
using real keys for the Hdfs store
implemented the listHeads method
added an existsPrefix method
added a listDropRightOne method
removed the listDropRightOne method
Switch copyright to Ambiata
Merge pull request #4 from ambiata/topic/licence

Switch copyright to Ambiata
Merge pull request #3 from ambiata/topic/store-keys

Use real keys for the Hdfs store
updated mundane
use the latest mundane for DirPath/FilePath
using the master version of mundane