fix/implement multiline legend

Proper implementation of multiline legends
Adaption and renaming of the testcase "one_point" to "multiline_labels"

Tested in R2014a and R2014b

Unfortunately in R2014a the line `legendString = get(child, 'DisplayName');` in `findLegendInformation` has issues with multiline fields. A legend with `{'ab','cd'}` is read out as `acbd`. 
`legendString = reshape(legendString,2,length(legendString)/2)` would properly reorder the characters.
I consider this a bug and outside the scope of this pull request.
@egeerardyn How should we handle this?
I will try to elaborate tomorrow. It is needed for the multiline ylabel in the new testcase, when it is executed in R2014a. For some reason the for-loop `for s = strings` in a related function (don't remember by heart now) would not go through all cells due to the different "orientation" of the cell array.