A workaround for the impossibility to install different requirements-files for different Python versions at travis-ci.org.
Now able to install the dependencies from everywhere.
Merge pull request #213 from okin/master

Wordpress Import: import into a user-defined location
Merge branch 'master' into travis
Merge pull request #218 from okin/master

Copy messages when installing
Merge pull request #219 from okin/travis

travis-ci.org: support for Python 3
Merge branch 'master' of https://github.com/ralsina/nikola