Renaming aux to vaux so that it can be checked out in Microsoft Windows.
Make it look like a MarkDown / Jekyll page.
Merge branch 'pages-source' of https://github.com/UniversalDependencies/docs into pages-source

Conflicts:
	_en-dep/aux.md
	_en-dep/aux_.md
	_en-dep/vaux.md
	_fi-dep/aux.md
	_fi-dep/aux_.md
	_fi-dep/vaux.md
	_ud-dep/aux.md
	_ud-dep/aux_.md
	_ud-dep/vaux.md
	_ud-feat/InflectionalFeatures.md
	_ud-pos/AUX.md
	_ud-pos/AUX_.md
	_ud-pos/VAUX.md