Add feature #11
Fix _total_rows in the meta table
replace all of the instances of phile with File.
travis ci: Use the latest version of Disco for builds.

This will let us catch the errors sooner.
Fix the BooleanIX, handle the key missing case
Fix issue #50
Make bit type stick to 0 or 1 explicitly
Adding purge_local flag to insert command
Add filter functionality for preprocess in insert()
Fix purge_local
Revert the commit 922dc9f7e
Add max_cores, profile, and auto_purge
Bump version to 0.2.5