upgrade MI and MIRTx
Switch to our standard language

This means we get normal installation instructions and actually have a
link to the bugtracker, as well as putting a copyright on it.
I have no idea why this didn't use our standards.
This only works on 4.0.0 or greater, so flag it in Makefile.PL
change to the normal gitignore
Fix 4.2 deprecation warnings

We can't just switch to /Elements/EditCustomFields and remain 4.0
compatible, so we have some shenanigans to figure out what version
we're on.  /Elements/EditCustomFields didn't exist in 4.0 which makes it
easier.

Reported by Carlos Fuentes and Martin Budsjo
Add a standard changes file
bump version for 0.02