function generateLookupPaths(lookupPaths) {
  lookupPaths = lookupPaths || [];
  lookupPaths = lookupPaths.concat(Blueprint.defaultLookupPaths());
  return uniq(lookupPaths);
}
Combines provided lookup paths with defaults and removes
  duplicates.

  @private
  @method generateLookupPaths
  @param {Array} lookupPaths
  @return {Array}