Added titles to the rest of the pages

--HG--
branch : kf-titles

help.html

 <%inherit file="main.html" />
+<%block name="title"><title>Help - MITx 6.002x</title></%block>
 
 <%include file="navigation.html" args="active_page='help'"/>
 

profile.html

 <%inherit file="main.html" />
+<%block name="title"><title>Profile - MITx 6.002x</title></%block>
 
 <%!
     from django.core.urlresolvers import reverse

staticbook.html

 <%inherit file="main.html" />
+<%block name="title"><title>Textbook – MITx 6.002x</title></%block>
 
 <%block name="js_extra">
 <script>