Mostly import cleanups, some doc enhancements.

Added fully-qualified namespaces to internal imports within encoders so they would link properly in the doc build.
Adding encoders to doxyfile.
Doccing arithmetic encoder.
Working on doccing base Encoder class.
Update log encoder to work with current pipeline
Fix bug with division by int returning 0 (thanks Python). Re-arrage init params for readability
Add numpy for use in closenessScores()
Clean up Log Encoder tests. Add tests for count of buckets, output of closenessScores(), and output of getDecoderOutputFieldTypes(). Fix bug with integer vs scalar division. Remove previous dev cruft.
Finished documenting base Encoder class.
Implements feedback from @subutai on Log Encoder. Log encoded values are no longer scaled by 10x (not sure why this was done originally). Added better comments, doc string, and tests.
Merge pull request #560 from csimons/master

Updated license verbiage in source code per #543.
Merge pull request #562 from csimons/master

Various spelling fixes in code comments.
Remove rounding from log encoded min/max. This was unexpected behavior and was causing worse results.
Update Log Encoder tests to match new min/max logic in encoder.
Merge pull request #539 from iandanforth/mer334

fixes #540 - Update log encoder for modern use. Also fixes a bug in scalar encoder. Other misc cleanups.
Fixed typo in error message ('neither ... not' -> 'neither ... nor').
Sleep properly rather than spinning CPU; fixes #454.
Mostly import cleanups, some doc enhancements.

Added fully-qualified namespaces to internal imports within encoders so they would link properly in the doc build.
Adding encoders to doxyfile.
Doccing arithmetic encoder.