Merge pull request #115 from cleberjsantos/master

Update varnish.rst and add howto for varnish 4
Fix typos and rst syntax in varnish docs
de-PEPify
de-PEPify
Merge pull request #118 from plone/varnish-fixes

Fix typos and rst syntax in varnish docs, remove line endings that make translation difficult (also known as de-PEPify)