Day 11: Blank fields, refactor, signup

Double blank fields for the login page were made available. Refactored
loginProcess for failed logins to a format that read more easily. Signup
needs to make sure that the password and the password verify fields are
the same. Addition of posts and (possibly) comments on said posts should
appear later this week. Some refactoring needs to be done, especially in
loginProcess. Too repetitive.