added license file
Update connection.py

On some function of some methods mailjet server answer with an 401 with a www-authenticate header set to 'Provide an apiKey and secretKey' so urllib2.HTTPPasswordMgrWithDefaultRealm didn't try to connect after getting a 401
Merge pull request #4 from khertan/master

Workarround for authentification errors
bumping version for authentication fix
Merge github.com:WoLpH/mailjet

Conflicts:
	mailjet/connection.py