Changed FeatureStore/Dictionary to only deal with Store abstraction

- Removed filesystem specific code from FeatureStore and Dictionary
- Removed FeatureStore importer and creation cli
- Changed interface to use ResultTIO instead of ScoobiAction or Hdfs
- Added tests for FeatureStore
- Changed most uses of HdfsRepository to Repository
- All paths changed to Reference (Store, FilePath) pair
Update docs
Tests for store path listing
fix tests
Added back FlatFactThriftStorageV1 to Chord, removed job.setOutputFormatClass from FactsetJob as its not needed
Merge pull request #121 from ambiata/topic/generalize-metadata

generalize metadata