Major Description
Currently, when executing a cell with a variable declaration in Toree (0.2.0) & Scala 2.11 the cell result contains verbose output which was not present prior to the fix for TOREE-380:
Before TOREE-380 there was not output when a cell was only declaring/defining a variable
```
var v = "abc"
```
After TOREE-380
```
v = abc
Out[2]: abc
```
This is breaking consistency/compatibility with previous versions of Toree. Also there are users that use some kind of code cell hiding to prevent credentials etc being displayed in a notebook - this use case now breaks since the cell output now displays any credential values that are assigned to variables.