set env settings variables from app-settings and cwd-settings files

[naturallymitchell]

in addition to torchbear.settings.var make app-name.settings.var available. get app-name from app's torchbear.scl

so app's code base should have torchbear.scl
and user app should have app-name.scl

I guess, app level settings are optional and up to user to use

[naturallymitchell]

would you please follow up with #242 and make simple-webserver's torchbear.scl so that torchbear will say "running Simple Webserver"?

[dariusc93]

So put the name "Simple Webserver" into simple-webserver.scl and fetch it from there?