Add some ideology to contributing.md

//FREEBIE
Expand ideology.

//FREEBIE
More ideology.

// FREEBIE
send email addresses as mms

// FREEBIE
Merge pull request #1550 from mcginty/email-send-fix

send email addresses as mms
Validate recipients at send time rather than when constructed.

Fixes #665
Support for multiple APN settings on the same provider
Use dynamic PBE iteration count.

Fixes #184
Fixes #247
Add sorting by default phone number

Currently the order of numbers is times contacted -> displayName ->
phone type (mobile vs. home, etc.). This adds whether the number has
been saved as the default number for a contact to sort numbers belonging
to the same contact.

Fixes #580
Fixed capitalization inconsistensies with Android guidelines.

Fixes #673
Do country code detection if we can't get the full number off SIM.