Fix setting rotation on map creation.

[manthey]

Add a test that map creation parameters are honored.

Prior to this, you couldn't set the rotation when creating a map. That is,

var map = geo.map({
  node: '#map',
  rotation: Math.PI * 0.5
});

would still have a rotation of 0, despite all other parameters being settable on creation.

[aashish24]

Nice.