Add more control variables

Include perl5db's trick fro maintining $DB::single even when multiple stack
frames are unwound
It now works as a web service.

When the debugger stops, it prints a URL to STDOUT, and every time
that URL gets a hit, the debugger steps
print out a table showing the source and current line

Seems to be showing the wrong line number, though
Make source_file() return a ref to the list of file lines

It actually returns a glob, which we can use as a listref
Move the 'no strict' outside so it'll be a bit faster
Rename to the real module name
switch the package name to match the module name
initializer method name change
Picking the function to call on a request is now delegated to the Router.
Add a route for getting files

Teach the Router to handle regex captures and and pass them to the callbacks.
Remove the process pid from the URL for development

changing the PID all the time is annoying