Changed the name of the handler func.

This way, the name is less nebulous than "SessionHandler".
Added a gitignore rule
Big, big commit:

Initial run of database structs.

MongoDB connection/handling code.

API endpoints "POST /api/sessions" and "POST /api/users".
Fixed the struct method pinning; changed from (u User) to (u *User)
Added function Jsonify.

Convenience function for quickly encoding a value as JSON, and writing
it out to a http.ResponseWriter.
Added comments above handler functions.
Teeny-tiny fix-up; set the user.Enabled field to false
POST /api/users/{userId}/activate
Fixed an incorrect string formatting directive: %s -> %d
Added Session.User field.

It is an mgo.DBRef to the user that owns the session.
Added convenience function to pre-parse the Authorization request header
Created RequiresAuth wrapper type.

It also satisfies the http.Handler interface.
Removed all Go code.

It is going into a different repository.
Moved UI sources into top-level of the working directory.
Updated README