Allow instances to force contact sender email

Certain email servers (most, all?) prohibit traffic
that appears to be routed from someone on the network

For instance, if all mail from an OTM site is going to
jane@company.com and jim ("jim@company.com") sends feedback
the message structure will look like:
From: jim@company.com
To: jane@company.com
....
But mail.company.com will *reject* the email since it is
actually originating from otm's servers and masquerading
as company.com
Merge pull request #86 from ahinz/topic/email

Allow instances to force contact sender email
Speed up the verify page by limiting results

The verify page is falling over with alarming regularity. This commit
forces each of the 4 data sources to only fetch 50 results. This could
lead to a bit of an awkward user experience but it is certainly better
than the status quo of a 502 timeout error.
fixed bad username resolve
fix username resolve
fix username resolve
Update README.md

It's been mentioned that OTM v1.2 is best run atop Django 1.3. As such, django-pipeline version 1.1.27 needs to be used
Update speciesimport.py

Remove hard-coded "OpenTreeMap" from "treemap.models"
Fix syntax errors