previous pr++

[bharadwaj-raju]

Previous pull request with proper deb package.

• Add an install/uninstall script (install.sh)
• Add a --show-all option (as was originally default)
• Add a working deb package that builds from Git each time.
• Make code 100% PEP8 compliant (ran it through flake8 (PEP8 checker) this time)
• Make README clearer
• Change icons location to /usr/share/lks-indicator (this is done by install.sh)