added getter for realm

An extending class might want to override 'beforeMethod'. There it needs to have read access to the 'realm'.
cleanup
added test for basic plugin
Merge pull request #329 from elHornair/patch-1

added getter for realm
A new readme.
Merge branch 'master' of github.com:evert/SabreDAV
Fixed build status table
Attention to detail :)
verifyPeer is now protected. Bumped version.

Issue #332.
Merge branch '1.7' into 1.8

Conflicts:
	ChangeLog
	lib/Sabre/DAV/Version.php
Bumped version
Merge branch '1.8'

Conflicts:
	ChangeLog
	lib/Sabre/DAV/Version.php
Merge branch 'master' of https://github.com/evert/SabreDAV