[CI-SKIP] Travis: linux sudo vm's have more ram, also stop travis screwing with the git modules

.travis.yml

@@ -1,7 +1,10 @@
 language: java
-os: osx
+sudo: required
+jdk:
+  - oraclejdk8
+git:
+  submodules: false
 before_install:
-  - brew cask install java
   - git config --global user.email "travis-ci@travis-ci.com"
   - git config --global user.name "Travis CI"
   - ./paper patch