Familiar Prompt
---------------

Builds the prompt with the current user's username, the computer's hostname,
and with the current working directory in a manner that is familiar to most
people starting out with bash. Replaces the home directory with a ~ symbol.

EXAMPLE
-------
Username: zphricz
Hosname: Computer
CWD: ~/Documents

The prompt will look like this:
    zphricz@Computer:~/Documents$