Some minor tweaks and fixes:
 - removed useless Download.java
 * moved Starter to launcher package and fixed JVM Args
 * excluded mods/ from deleted directories
* Fix for JVM Args fix :/
+ constants for folder names
* typo in TerasologyStarter
Merge pull request #2 from skaldarnar/develop

Some minor tweaks and fixes:
Gradle: Add application plugin

gradlew run
gradlew distZip or distTar
gradlew installApp
Merge branch 'styleAndStructure' of https://github.com/mkalb/TerasologyLauncher into styleAndStructure