just a couple of tweaks to save some lines

Signed-off-by: Chris Jones <chris@jonezy.org>
added a gruntfile

going to look into compiling everything (templates) into a single js
file, then, at the very least i'll seperate out namespace, config and
helper stuff at the top of calculator.js and then compile them all into
a single calculator.min.js

Signed-off-by: Chris Jones <chris@jonezy.org>