Relative path profile - refactoring to configurable variables

[nrakochy]

This sets the generated path as a template param which can be configurable in luminus.clj (at this point simply set to :default).

The rationale for this would be the ability to add additional profiles to the template that would allow different project structures (think Docker services, for example).

That said, perhaps it is too much overhead, so I will defer to you if you think it is useful or not. Thanks for the great template...

[yogthos]

Looks like a clean way to approach this.

[Ramblurr]

@yogthos @nrakochy Since this commit a fresh project with +sass is broken:

lein new luminus test  +sassc 
cd test
lein run 

=>

Compile SASS/SCSS files.
sassc -t nested -I {{resource-path}}/scss {{resource-path}}/scss/screen.scss {{resource-path}}/public/css/screen.css
Internal Error: File to read not found or unreadable: {{resource-path}}/scss/screen.scss

edit: created standalone issue for this #340