fixing middleware account creation - creates User objects rather than LigoLdapUser, then overnight LDAP cron job will create LigoLdapUser for LIGO accounts

fixing display for Trigger and Contact models as this caused errors in IPython with certain unicode characters

Adding offline boolean parameter to Event model class

See merge request !4

adding offline boolean parameter to Event model class and associated code for handling it during event submissions

Allow events to be created with labels

See merge request !3

issue XMPP alerts when a log message is created from web interface and when a label is removed from an event

autoincrementing save for EventLog, EMObservation, EMFootprint, EMBBEventLog

See merge request !2