added a test that should be passed for ggplot2 style adding
Made an update to master that I want reflected in adding
vRbalExpressions.R added basic constructor for a verEx object
added simple way to get verEx objects from any of the functions, or an empty string for the initial object
basic addition works for both verEx() + then("help")
updated everything to use the verEx constructor and the +.vRbalExpression method to add two objects together. All tests pass
passes most checks, installs, and passes all of the current tests