Make some methods private.
Extract some "mixin" shared contexts from the hbase shared context.

It was getting unweildy.
Drop use of (now no-op) :test_classpath.
askari/schema/application aliases the v0 application class.

This protects disinterested code from versioning changes.  A schema
client still needs to be aware of format versioning, but they should
examine the `format` attribute of the application instance to do so.
Make a mess.