Adjust grapheme_strpos behavior for PHP versions

Merge branch '1.2'

* 1.2:
  Bump to v1.1.31

Conflicts:
	CHANGELOG.md

Merge branch '1.1' into 1.2

* 1.1:
  Bump to v1.1.31

Conflicts:
	CHANGELOG.md
	src/Patchwork/Utf8/Bootup.php

Bump to v1.1.31

Bump to version 1.2.5

add more mbstring shims

Fix mbstring shim for html-entities

update to Unicode 7.0

update composer.json

add Patchwork\Utf8::wrapPath() to easy portability