Add no_overflow option to Bar

[hfaran]

Currently Bar will happily overflow if you give it a value greater than the max_value (i.e., if max_value is 10 and you provide a value of a 100, the Bar will continue to draw past the 100% limit). The proposal is to add an option that will cap drawing the bar to 100% if a value greater than the max_value is given.

Marking this as a bug with in the label since the overflow is undesired behavior and should have an option to be disabled.