Refactor SciDBArray to use AFL for queries
Refactor SciDBInterface to use AFL
Add some remaining AFL operators/functions to afl module
Merge pull request #24 from ChrisBeaumont/afl-refactor

AFL refactor
Remove deprecated AFL Count operator
Merge pull request #25 from ChrisBeaumont/master

Replace AFL Count
Early detection of bad SciDBShimInterface urls

Closes #20
linting, PEP8
Rename get_interface -> connect, to mimic other array interfaces