Adds support for title case
Removes non functional code. Adds test for title case

Remove non functional code since MB_STRING and static::encoding() are no longer
availabe in L4.
Adds test for title case method.
Updates Str::title method

If function mb_get_info is available, run mb_convert_case.
Updates Str:title method

by crynobone: laravel is already using Patchwork UTF-8 so it's always available.
Updates Str:title method

Adds a period at the end of sentence for accurate grammar.
Merge pull request #1521 from JeffCost/feature/support-title-case

Adds support for title case