Merge pull request #33 from meadsteve/master

Add link to Monolog Bugsnag Handler: meadsteve/MonoSnag
Allow sub-notifiers to set version
Manually load in Autoload [Fixes #17]
Support nested exceptions [Fixes #19]
Fix test
Merge branch 'issue-cleanup'
v2.2.0
Merge remote-tracking branch 'canonical/master' into feature/stack-modification-function

Conflicts:
	src/Bugsnag/Error.php
	tests/Bugsnag/ErrorTest.php