Add term support to PACman roms.
Add bootstrap environment function

This bootstraps the Android environment. We try and handle UDEV, installing
packages, and installing repo.

Because of the package installation, running bootstrap requires root. You
can skip the HotSwapper bootstrap check by running ./bootstrap --skip. The
main HotSwapper script does not require root prvileges by design.
change script name to "hotswapper"

who wants to type capital letters. Not me.
Also change TARGET_VERSION to ANDROID_VERSION for clarity.
Update README to include bootstrap info

Adjust some helpful messages.
Allow passing no ANDROID_VERSION argument

By default, it will either build the latest, or get preempted by the
user-entered ANDROID_VERSION in the BUILD file.