Removing travis validator
Ignoring my local .ackrc file
Removing travis validator and validator exclusions.
Removing status history param to validators.
Validator statuses are posted individually.

Before this change, all nupic validations were combined and posted as
one status to the GH status API. Now each validation is posted
individually because GH handles statuses better.
Removing unnecessary status complexity.
Only processing state changes with external contexts.
logging via info() instead of log()
Logging context of state changes
Merge pull request #155 from rhyolight/status-api-updates

Simplify GitHub Status handling.