Update proportion test dialogue for binary data

Added dialogue for proportion tests for confidence intervals,
one-sample, and two-sample tests so we know upon which level of the
variable it builds the test
Fixed Dataframe Summary and added lost ".Table"

Previously for the Dataframe Summary, if there was only one variable of
type 'numeric' or 'factor', it came up with an error(argument of length
0) because it was not in a dataframe. Now everything goes into a
dataframe. Also added an accidentally deleted ".Table" print to
bivariate.
Added standard text interpretations of the tests
Added menu items and fixed data essentially constant error
Merge pull request #3 from Jgressel/master

Four New Commits- Gressel