encapsulated error mails in function
refactored chart export daemon to generic job execution daemon
added phantomjs plugin
added export-static-png plugin
fixed plugin manager script
added from header automatically if not defined
added adress for error mails
session is now initiated in bootstrap.php
added hook POST_CHART_PUBLISH
Job class json decodes the parameters
chart is public as soon the user enters last step
execute POST_CHART_PUBLISH hook