April release

• Subject line in emails is now configurable
• Login won't always take you to the contacts page
• Better mobile view on lists page
• Redirect to requested page after login.
• duplicate checking on contacts
• location dropdown on contact creation changed to typeahead
• Site to site connection upgrades.
• leaders on groups
• many fixes
  Dev:
• hooks for contact and group creation and update
• api set locations by name
• api use email to connect to a user's contact

requires: 4.7.1
tested: 4.9.4