changes for enchant.Label:
 - only calculate the style once during measure
 - replace <br> case insensitive instead of br OR BR
 - store the width of splitText for utility use in extending classes or
future functions ( we already calculated the width )
(fixed whitespace)
Merge branch 'develop' into LabelDimension
Merge pull request #304 from illfang/LabelDimension

Label dimension