Simplify the travis script using docker

.travis.yml

@@ -1,33 +1,7 @@
-language: cpp
+sudo: required
 
-os: linux
-sudo: false
-dist: trusty
-
-env:
-  global:
-    - DEVKITPRO=/opt/devkitpro
-    - DEVKITPPC=/opt/devkitpro/devkitPPC
-
-cache:
-  directories:
-    - "$HOME/.local"
-    - "$DEVKITPRO"
-
-addons:
-  apt:
-    packages:
-    - p7zip-full
-
-before_install:
-  - mkdir -p "${DEVKITPRO}" 
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then wget https://github.com/devkitPro/pacman/releases/download/devkitpro-pacman-1.0.1/devkitpro-pacman.deb -O /tmp/devkitpro-pacman.deb; fi
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo dpkg -i /tmp/devkitpro-pacman.deb; fi
-  - yes | sudo dkp-pacman -Syu devkitPPC --needed
-  - yes | sudo dkp-pacman -Syu general-tools --needed
-
-before_script:
-  - cd $TRAVIS_BUILD_DIR/
-  
+services:
+  - docker
+    
 script:
-- make && make install
+- docker run -it --rm -v ${PWD}:/project wiiulegacy/core:0.1 /bin/bash -c "(cd project && make clean && make)"