ContinuumIO/blaze — pull request #631 by mrocklin (2014-09-15 21:38:02+00:00)
Title: Server with foreign expressions

Previously The server gets a string like `'By'` and queries this
against `blaze.expr` to get the class `By`.

This doesn't work for expressions that aren't part of the main Blaze codebase.

Now we do this but, if it fails, we then check `compute_one` signatures.
This has the virtue of using the `dispatch` system to pick up foreign
expressions.