added forgotten header
Merged in idea-squirrel/ja2-stracciatella (pull request #1)

added forgotten header
Updated description of game settings

Courtesy of JAsmine-ja2.
Issue #108
Fix bugs in dealers' inventory

Dealers no longer buy items which are not listed in their inventories.
Tony no longer sells everything for 1 dollar.

This fixes:
  Issue #111 Bug with externalized dealer inventory.
  Issue #112 Another bug with externalized dealer inventory (Jake)
Fix issue #113 (JsonUtility_unittests.cc should not be compiled when WITH_UNITTESTS=0)
Update news
Build instructions for Mac OS X 10.9