Ditch Coverty as it was causing the build to fail

.travis.yml

@@ -1,17 +1 @@
 language: java
-
-env:
-  global:
-   # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
-   #   via the "travis encrypt" command using the project repo's public key
-   - secure: "f8donA0A+CYYr01l7pPO+VjCa57g6uLdYOeZKxDs8DW4kWVzeJ9HVlbpK2rD6as3h+lvoKLAIBMIOF/90Bog3BBUJDO0QqGW85Ww1dMuwBxpudupgFbDB/kQz7fkanvmhhFSoUerwaIXFicbBGy2f6bqp9oPNJSihdMXFjcbCSo="
-
-addons:
-  coverity_scan:
-    project:
-      name: "sanity/quickml"
-      description: "Build submitted via Travis CI"
-    notification_email: [email protected]
-    build_command_prepend: "mvn clean"
-    build_command:   "mvn -DskipTests=true compile"
-    branch_pattern: master