Moved LengthWord and SizeWord into words package.
Moved val length and val size in Matchers to MatchersWord.
Dropped ResultOfHaveWordForCollectedArray/String and a few other methods
from the collected Array class that weren't needed anymore.
Merge branch 'matchers-refactor' of git://github.com/cheeseng/scalatest
Simplify signature of matchSymbolToPredicateMethod; didn't need the type parameter.