Error on double handling in REPL

The following series of commands seem to hit a bug in scriptcs:

``` C#
var a = new double[5];
a[1] = 2.3;     //All is well so far
a[1] /= 0.5;    //prints 1.39E-309, a calculation error. Should be 4.6
a               //scriptcs hangs, and exiting returns to normal command line, now with a new and fancy font color
```

(Edit: Wording on the line with division)
