Reduce Travis' Diskspace consumption by deleting jdks' download cache and intermediary folders

.travis.yml

@@ -46,6 +46,8 @@ install:
   - ./gradlew buildSdk
   - cd jdks
   - ./download-jdks.sh
+  # Reduce Diskspace by 3G
+  - rm -rf jdks/local/8*/{downloads,linux-i586,linux-x64,windows-i586,windows-x64}
   - cd ../
   #- '[ -z "$TRAVIS_TAG" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && ant -Dstorepass="$NBM_SIGN_PASS" hudson-nightly | awk "{printf(\".\"); fflush(stdout)}" || :'
   #- '[ -z "$TRAVIS_TAG" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && scp -rp -i nbproject/private/www-updater.key build/updates/* [email protected]:/var/www/updates/nightly/3.1/plugins || :'