Change visiblity of properties on pluralizer.
Fix issue in Str::finish() with multicharacter cap.
Simplify Str::is() by removing useless special handling of '/'
added another test.
Merge branch 'str_is' of https://github.com/vlakoff/framework into str-is
Adding Str::is tests.
Make extend() return manager instance.
Merge pull request #2609 from franzliedke/patch-14

Make extend() return manager instance.
Fix conflicts and merge.