fixed bug where empty ipeer evaluation reminder emails were sent

- created delta_8 that creates a evaluation reminder email template
	- also an update to existing unsent reminder emails to use
	the newly created template
- added the evaluation reminder email template to ipeer.sql and
the one with sample data
- fixed Upgrade314 script's documentation
- fixed email template model tests
- created a 315 upgrade script to run delta 8
Fix emails templates filling in wrong names.

Users were getting emails where they were being addressed by the wrong first
name. Turns out that the email template replacement was modifying the original
template, so it replaced template variables with the info of the first user and
alone after that. Everyone was getting same email as the first user.
Fix the missing comma
Bump version to 3.1.5
Merge branch '3.1.x'