New methods:
* mooda.es_create_indexes(): Creation of ElasticSearch Indexes to save a WaterFrame object.
* mooda.read_nc_moist(): Open a NetCDF file from [MOIST](http://www.moist.it/about/information).
* WaterFrame.to_es(): Injestion of the WaterFrame into a ElasticSeach DB.
* WaterFrame.metadata_to_html(): Make an HTML file with the metadata information.
* WaterFrame.to_csv(): Make a CSV with the WaterFrame information.
New method arguments:
* mooda.read_nc(path, **decode_times**=**True**)