Fix/New ability for header id mutation
Merge remote-tracking branch 'origin/1.x' into 1.x

Conflicts:
	WikiLingo/Base.php
	WikiLingo/Expression/BlockType/Header.php
Fix/New ability for header id mutation
Merge branch '1.x'

Conflicts:
	WikiLingo/Expression/Plugin.php
Merge branch 'master' of https://github.com/wikiLingo/wikiLingo