test(travis-ci): make sure install-info is installed for travis-ci

The InfoRegen trigger uses the install-info tool to regenerate info file
indexes after a pkg merge.

Also, we move /usr/bin/ginstall-info to /usr/bin/install-info otherwise
the wrapper outputs warning messages that cause issues for the InfoRegen
tests.
test(travis-ci): add support for python3.4 testing
style(merge/triggers): whitespace consistency