Add travis support

.gitmodules

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+[submodule ".travis-support"]
+	path = .travis-support
+	url = https://github.com/kemitix/kemitix-travis-support.git

.travis-support

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+Subproject commit b97def251b784ecc8de6d3cc30d2793ac0bd375e

.travis.yml

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+language: java
+jdk:
+- oraclejdk8
+cache:
+  directories:
+  - "$HOME/.m2"
+install: true
+script: "./mvnw --batch-mode --errors --update-snapshots clean install"
+after_success:
+- sh .travis-support/coveralls.sh
+- bash <(curl -s https://codecov.io/bash)
+deploy:
+  provider: script
+  script: sh .travis-support/deploy.sh
+  on:
+    branch: master
+env:
+  global: