fix the demo output of the info subcommand
fix the printing and order of metadata when using info
fix the verbose output example
fix the demo debug output
update the changelog
remove unused import
fix usage of compression ratio, as per Wikipedia defintion

cc @FrancescAlted
update changelog
fix capitalization of Numpy
add a link to the bloscpack paper
list of publications
fix changelog entry
be explicit about what blpk is exactly
activate python3 tests via travis
fix all relative imports to be py3 compatible
fix StringIO import to be py3 compat
iteritems missing in py3
use seek(0) instead of reset()

The BytesIO class seems not to have a reset().
py3 string type
py3 int types