Fix top-bar links and nav lists

Use User.get_profile().get_absolute_url() instead of User.get_absolute_url
for the link to the user profile.

Also fixed bootstrap.js and CSS styles to distinguish between #navigation
<ul> and the user <ul>.

Change-Id: I83152d798b84e3564a15ac17f4d93a2f46d1ecf6
Added Page model and views

Change-Id: I09f226dee98eb6013f9f363d0235deca9973128a