added source icon back to basic editor toolbar as editors will inevitably jack up and thus access to source is required
catch asset exception if actual file not found and throw 404 instead
added back email preview link
asset email/page builder tokens
fixed lead/page EmailSubscriber functions to not set clickthrough lead if it is null
added back symfony profile update on ajax call
added landing page tokens to landing page builder to insert links to other pages and minor enhancements to event
Merge branch 'master' of bitbucket.org:allyde/mautic