add email and json interface for detecting pending remediations
- add email notification when an event is remediated and is not auto-approved (that is, whenever there is a pending remediation).
- question: who should the mail be sent to? Detector admin/contact? ExemptionAdmin? ExemptionAdmin and everybody who can be an ExemptionAdmin (that would be the ExemptionAdmin, SecurityAdmin, and TissueAdmin, ugh, not a good option).
- add json API for querying number of pending remediations
This is LOW priority but should be added when we get back to making TIssue changes post NCIS-deployment.