Bashellite lacks proper unit testing

[codrcodz]

Since bashellite is written using a hybrid of declarative/functional programming paradigms, it lacks the ability to easily integrate and write unit tests.

Proposed solution to correct this is three fold:

1. Rewrite each individual function/subroutine to set local variables only and echo one return value per function. Ensure all code lives in a function. Ensure global variables are limited to read-only constants.
2. Rewrite the main function to store and pipe output from one function to another.
3. Source bash-test or assert.sh and write tests for each isolated function.

[codrcodz]

The util-libs now have near 100% code coverage thanks to #40
Still need to do the same thing for bashellite-libs.