Move existing tests to ./test

Convert existing tests to RackUnit
Full testing still not implemented
Add accessor functions to allow use across modules

(ve-prefix! v)
(set! ve-prefix v))
And so forth
Update to fix cross module problem, move tests

Verbal expressions now works across modules using accessor functions.

Tests moved outside verbal-expressions.rkt and implemented with
Rack-unit
Merge pull request #1 from VerbalExpressions/v0.2

V0.2