Add Gradle task "createVersionInfoFile"

Gradle generate during Jenkins build a file "versionInfo.properties".
The new class "TerasologyLauncherVersion" reads this file and offers
getter for the properties.
Merge pull request #5 from mkalb/version

Add Gradle task "createVersionInfoFile"
Fixed a bunch of checkstyle errors and switched to use jenkins buildNumber files instead of updater.movingblocks.
Fixed header comments.

Updated/Added License headers

Added license file and updated README