Try to fix android build on travis
Try to fix android build on travis

Getting "InvalidKeyException: EC parameters error" when downloading
gradle.

Running on precise might fix it.

vsch/commonmark-java,atlassian/commonmark-java,vsch/commonmark-java,commonmark/commonmark-java,atlassian/commonmark-java,atlassian/commonmark-java,commonmark/commonmark-java,commonmark/commonmark-java,vsch/commonmark-java