Fix: save lowercased emails
Fix: save lowercased emails

Any email will be turned to lower-case when the ModelForm for Person
model is checked for validity.

swcarpentry/amy,vahtras/amy,vahtras/amy,pbanaszkiewicz/amy,vahtras/amy,swcarpentry/amy,pbanaszkiewicz/amy,pbanaszkiewicz/amy,swcarpentry/amy