Unable to specify the number of digits of precision and/or the exponent value when rendering fuzzy numbers

[rchillyard]

In the Foucault pendulum example (FoucaultSpec.scala), we have:
length.render shouldBe "6.76[14]E+01"
which could be rendered as 67.6[1] or 67.65[1] if we had the ability to specify the Exponent (in this case, 0) or the number of decimals (1 or 2).