Adds support for FGE volts channel from BDT. Edits observatory metadata with scaling and FGE parameter added.

Adds KAK into observatory metadata's dictionary definition.

Adds KAK into observatory metadata dictionary.

These changes were deployed directly to production (mage2) on November 8. This is a belated update to the official metadata.

Saint John's -> St Johns
Yellow Knife -> Yellowknife

Discovered a small typo in the BLC (Baker Lake) entry. Fixed it.

Only the BOU observatory had updated DECBAS values. This commit includes all DECBAS values adopted on July 1 2013, which estimated from the 2011 annual means. These values have been used in the preliminary data exported to Intermagnet since they were adopted, but they have not been used in geomag-algorithms.

We recently reviewed our various data products and found discrepancy in some of the metadata.  We have updated these values based on recent measurements.  I've modified these values in ObservatoryMetadata.py to be consistent with our other data products.

Cleaned up the metadata to meet expectations from IAGA2002,  ie latitiude/longitude are now strings, etc.

put metadata in sub-dictionary, added data_interval_type in outer dictionary,  added code to deal with the new observatory dictionary format

Removed unneeded data from DEFAULT_METADATA. Added routines to fill sensor_sample_rate and data_interval_rate based on the interval.  Moved setting some data from EdgeFactory to public set_metadata method here.

Added EdgeFactory, ObservatoryMetadata and their accompanying tests.  EdgeFactory only has get_timeseries implemented, put_timeseries will be done later.  ObserveatoryMetadata has the Observatory information hardcoded for now, future implementations will use something more dynamic.