Run login page through HTML::Mason::PlackHandler

Successfully got login page served through Plack. Very simple handler
setup in app.psgi
Change length() to scalar() in TUSK::Functions
Add styles, scripts, graphics, icons

Statically serve with Plack::App::File.

Reduces Apache configuration at expense of running statically served
content through Plack. I believe Apache can still be setup to preempt
this behavior but running everything throug Plack is convenient for
development use.
Add die to cpanm call in cpan install script
Add DBD::mysql and tusk.conf to INSTALL-macos.txt
Skeleton of webapp testing in t/app.t
Move root mount to end in app.psgi

As recommended in Plack::Builder documentation.