Add flags to build script

#3190 

Adds ability to include operations modules from build script.

Added usage information to the build script and docroot option:
usage: ./scripts/build options

This script builds the openscholar application.

OPTIONS:
   -h      Show this message
   -d      docroot directory name defaults to 'www'
   -o      Directory to include OPS modules, not included otherwise ex. 'sites/default/'
+ exit 1

Ops modules are added under the site you need them for not the main profile.