Add Create-User page

ub 14

When no user is logged in, show a login and a create-user button
on the homepage.
When a user is logged in, show a create-post button on the homepage.
Fixed other UI issues: now create-user form doesn't show the password
in plaintext but rather with asterisks, and now the user index page
doesn't show users' passwords.
Merge branch 'develop' of ssh://github.com/osu-mist/ublog into feature/ub-14-add-signup-page
Cleanup nav-bar, use HTML5

ub 14

As per comments in GitHub, HMTL is now being used for text-area inputs.
The navigation code has been moved to the taglib used in main.gsp.
Fix post id test

ub-14

In the Post Integration test, the post's id is now checked to ensure
that it is bigger than the previous max id in the database, rather than
checking that it is 1. Cleanup method's indentation has been fixed.
Merge pull request #7 from osu-mist/feature/ub-14-add-signup-page

Add Create-User page