Added a ton of stuff:

Added new JSP pages so that pages share the similar html, so now all JSP
pages have <%@ include %> tags to share common html. 

Added an Ajax example for signing in. The ajax code is located at
views/ajax. I include this ajax jsp page in the
views/include/javascriptSource.jsp (or something like that). Also
updated the SignInController and added an AccountsController to handle
going to the accounts page. 

Added a tag handler example for signing in. You can see the custom tag
in the views/include/navbar.jsp file. Its called <signin:SignIn />. I
map this custom tag to our tlds directory and in the only tld file we
have in there. The actual java code for the tag handler is located at
com.mimir.library.customtags in SignInTagHandler.java. 

Added a constants class so we can store all our constants info there, so
we don't have naming issues down the road. 

Created a basic RegisteredUser model for now as an example for logging
in and injecting our model's class using ajax. 

Added some more dependencies to pom.xml, I think stuff for sending json
and I'm not sure what else. 

I think that's it.