some changes:

- add stream comment class to handle comment activities on stream
- add basic ajax stream update
view single post is here again
always show comments for view single post
fix: cannot comment on view single post page
view: singlepost: show user full name on top bar
404: show user fullname and notifications count
fix PHP warning
js: post: using new keyword
fix show all comments button not working
fix typo
page is a component too
fix cannot post to profile
route: post: rearrange code
simple implementation of load more button
stream: fix javascript error for newly added post
hide load more button if no more posts to load
add some TODO
add comment to stream load more implementation
move message related controller to Message controller class
non-registered user can update do "load more" on stream