use long form for exclusions

by using the group and module for dependency exclusions,
the pom exclusions will be properly generated for us.  enableMaven no
 longer needs to manipulate the pom, although we do need it called so
  that the default params for the pom are populated (license,
  repo location, etc.)
Merge pull request #99 from metridoc/cleanup-gorm-deps

use long form for exclusions