Updated to latest Gradle and project structure

.editorconfig

.travis.yml

build.gradle

gradle.properties

gradle/wrapper/gradle-wrapper.jar

gradle/wrapper/gradle-wrapper.properties

gradlew

gradlew.bat

src/main/java/de/thro/inf/prg3/a11/App.java

src/main/java/de/thro/inf/prg3/a11/MenuSelection.java

...ain/java/de/thro/inf/prg3/a11/openmensa/OpenMensaAPI.java

...a/de/thro/inf/prg3/a11/openmensa/OpenMensaAPIService.java

...in/java/de/thro/inf/prg3/a11/openmensa/model/Canteen.java

src/main/java/de/thro/inf/prg3/a11/openmensa/model/Meal.java

...n/java/de/thro/inf/prg3/a11/openmensa/model/PageInfo.java

...main/java/de/thro/inf/prg3/a11/openmensa/model/State.java

...st/java/de/thro/inf/prg3/a11/tests/OpenMensaApiTests.java