Bug in Grid class, row count reported on column out of bounds error

[dparker]

Minor problem, the check is correct, but the report is wrong, so you
can get:

java.lang.IndexOutOfBoundsException: There are 1 columns, so no element
can be added at column 0

The code (in 1.1.0) in prepareCell looks like this:

if (column >= numColumns) {
throw new IndexOutOfBoundsException("There are " + numRows
+ " columns, so no element can be added at column " + column);
}

[Emily]

Yep, looks like a bug to me.