make unlinking the install.sh reliably work on windows hosts
run install.sh with `sh` rather than `bash` since bash-isms are now removed in latest install.sh
comply to RuboCop rules, fixes travis build (and add some logging)
Merge pull request #65 from tknerr/fix-unlink-on-windows

make unlinking the install.sh reliably work on windows hosts
Merge pull request #66 from tknerr/use-sh-instead-of-bash

run install.sh with `sh` rather than `bash`...