Java 11 template uses Maven Central for its components

Changelog for 1.8.0:

• PR #214 Use external jars from templates-sdk by @alexellis

Commits
46a5938 Update entrypoint to published jar version by @alexellis
bc732b9 Create function zip and ship into final stage of build by @alexellis
23a9ae2 Add maven-central config by @alexellis
9ab5014 Update README to say java11 by @alexellis
530a843 Add openfaas authors to copyright by @alexellis
541cdb3 Add note for chmod by @alexellis
382aa66 Fix issue with Go and modules by @alexellis
93eda72 Add EOL to node12 by @alexellis
b530d06 Apply linting for node12 by @alexellis

Generated by Derek