Added a quick way to see if directories have been set up correctly. This
also eases testing for future ways of setting directories through
environment variables or options.
Now that the project is finding a little adoption it is really high time
to bring some tests into the code to ensure everything works as it
should.
This first version will only provide a simple test harness from which
tests can slowly be written for other parts of the program.
Switched sections for dependencies and installation around and created
better sub-headings.
Added section on installing packaged AUR version, thanks to @firegem for
packaging it!
Fixed some whitespace on line endings.
Closes #6.
