Create gpg keys for java code signing

[nrktkt]

For the java port, code deployed to maven central (see #36) is required to be signed. To this end, a gpg key should be created for the organization. This key should be controlled by the maintainers of the organization, and can be securely added to a CI server for automated deployment.

[pradyunsg]

Out of my zone. I'm not going to neither in control of the CI server nor willing to handle the gpg key.

Deferred in entirety to @getify.

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PS: @kag0, simply typing #36 will also link the 36'th issue. You don't need to paste the whole url.

[nrktkt]

I've made up a little guide for continuous deployment to maven central, it includes a section on gpg key creation and management.