Vector: add undocumented but required self.encoders field
add imports for Vector*Encoder
add imports to MultiEncoder
add PassThru to init
Merge branch 'master' into vector
Ping Travis
Merge pull request #443 from breznak/vector

small fixes for Vector
Include notice re: pip 1.5 changes
Merge pull request #537 from oxtopus/pip-fix

Include notice re: pip 1.5 changes
Retrying travis-artifact gem install.

This gem installation has been chronically failing. After raising https://github.com/travis-ci/travis-artifacts/issues/22, I was instructed to try this fixe. Perhaps it will help.
Merge pull request #542 from rhyolight/travis-retry-artifact-install

Retrying travis-artifact gem install.