Minification breaks Schema.registerType

See https://github.com/pocesar/promised-jugglingdb/pull/3 I would offer a pull request here, but github only allows one fork of a project at a time per user (and I already have promised-jugglingdb forked), sorry!

The issue references a pull request in a related fork (pocesar/promised-jugglingdb#3). Examine that PR to understand the minification problem with Schema.registerType. Look at the jugglingdb source code around schema registration and minification processes. Determine what changes are needed to fix the breakage, likely in the core ORM modules. Test the fix by building and minifying the project.

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