associateLead = function(properties){
    if(properties.email !== undefined) {
      email = properties.email;
      email_sha = sha1(Munchkin.sKey + email);
      properties.Email = properties.email;
      Munchkin.munchkinFunction('associateLead', properties, email_sha);
    }
  }
@ngdoc overview
@name angulartics.marketo
Enables analytics support for Marketo (http://www.marketo.com)

Will not be considered loaded until the sKey attribute is set on the Munchkin object, like so:

Munchkin.skey = 'my-secret-key';

for event tracking email is a required attribute