Update gradle versions.
Ignore lint errors for sample module.
Make gradlew executable for *nix and OSX.
Ignore .gitignore files.
Changed namespace com.astuetz -> org.tuxdude

Since this repo is a fork, change the namespace to avoid ambiguity.
Add a maven pom.xml for maven builds and deployments.
Add instructions for deploying.

Deploying using either gradle or maven works.

NOTE: To deploy using maven, invoke mvn deploy from the library
directory. This might be fixed in a future commit.