Make poly work on linux - bare minimum.

[tjstub]

This is just a quick improvement to do the bare-minimum to make poly work out of the box on linux. Namely,

• Packages should be installed locally.
• Some commands need to be Sudo
• Pillow was missing from the requirements.

There are some other improvements that could be made to the install script. Suggestion for future improvements:

0. the clone is done regardless of whether a repo exists or not.
1. Clone Goes to the cwd; Where the user is may or may not be writeable. Try for ~/ or /tmp
2. Consider a trap for ensuring cleanup on the bash script.
3. Probably shouldn't go to /usr/bin/ for the app. Mayhaps /usr/local/bin or ~/.local/bin? Can check path to decide.
4. Why does it matter if poly exists? what if I want to update it? Overwrite that guy!
5. Rather than -f /usr/bin/poly, consider command or which to discover it
6. Consider enabling bash "safe mode"
7. Mark script with /usr/bin/env bash
8. Consider removing absolute path commands. Could cause issues on other systems.

If you want, I can make a ticket for these, if you agree, I just wanted to drop this by while it was in my head. Good work, it's pretty cool!