adding basic travis setup
don't test 2.6 and 3.3 for now
add a travis build-badge
update changelog
Install bloscpack and then test with cram
try again with 2.6
spec cram version
Merge branch 'travis-ci'

* travis-ci:
  spec cram version
  try again with 2.6
  Install bloscpack and then test with cram
  update changelog
  add a travis build-badge
  don't test 2.6 and 3.3 for now
  adding basic travis setup