Create a Makefile

[michohl]

Create a Makefile so we can more easily build a binary that can be distributed more easily.

Should support the following actions:

• build
  • build the binary into a directory git is ignoring
  • Optional architecture flags
• clean
  • delete the build on disk
• install
  • copy the binary into a location in the user's $PATH they have write permission in
• uninstall
  • rm $(which monkey)