Add Distro Detection

Adds Linux distribution detection to install.sh so the right dependency
install script runs.

Changes:

 * install.sh
Only Install Dependencies on Linux

Modifies the install script to only offer to install dependencies
on Linux.

Changes:

 * install.sh
Prompt User to Install After Build

Adds code to prompt the user to install the software after building.

Changes:

 * install.sh
 * src/build.sh