Document topic branches

Since we made the graph branch, and since I just moved the branch pointer unilaterally, I figured I ought to legitimize such things. This commit updates the contributing document to describe how I think topic branches like this ought to be handled.
Upping pom.xml version

I'm setting the version in `pom.xml` to 0.6.0-SNAPSHOT, meaning we're currently in the process of developing version 0.6.0 of the schemas. We definitely have to have a version greater than 0.5.1, since that's our latest release, and since then we've made a number of potentially breaking changes, like stripping the "GA" prefixes off of everything, so I figured we would want to start with the 0.6 series.

In the future, when we do a release we ought to set this to exactly the version we release (so the tagged v0.6.0 release should have 0.6.0 here). The tagged v0.5.1 reports itself as "0.1.0-SNAPSHOT", which is a bit of a problem if anyone wants to depend on our compiled schema JARs.

Closes #197.
Require review of all (and only) actual commits

If you want to fast-forward a branch up to master you can, but if there is actual merging involved you need to pull request it for review.
Making Jerome's changes

Hopefully slightly clearer to read now. @jeromekelleher?
Move models and RPC methods out of root package

This updates the namespace to place the models into the
org.ga4gh.models package and RPC methods into the
org.ga4gh.rpc package. Previously, all objects were on
the root package org.ga4gh.
Fixing whitespace to be up to spec.
Merge pull request #209 from massie/namespace

Move models and RPC methods out of root package
Merged conflicts from #209 and #205.
Merge branch 'adamnovak-whitespace'.

This was a merge of conflicts between PR #209 and #205. Whitespace issues
now integrated with the namespacing of methods and models.
Merge pull request #200 from adamnovak/version

Upping pom.xml version
Merge pull request #199 from adamnovak/styleGuide

Document topic branches
Update and rename src/main/resources/avro/wip/metadata.avdl to src/main/resources/avro/metadata.avdl
Update and rename src/main/resources/avro/wip/metadatamethods.avdl to src/main/resources/avro/metadatamethods.avdl
Merge pull request #213 from mbaudis/master

Moving metadata out of WIP