Dynamic databases and store schema

[syabiku]

This starts to address #9. If a manager is requested, but the database name does not exist, it will create a new dynamic database; then, store schema must be defined for it before database can receive data. DbStore class now has a property to distinguish dynamic versus static databases. Behavior of static databases and methods for operating on them should not be affected by this PR.

[nwestfall]

Great submission! I think I want to discuss the whole dynamic part a little more, but I think this has great benefit to the platform. Just want to think through some of the workflows a bit more, to support it easier.