Merge pull request #92 from RenchuSong/master

My Groups
user home navigation
gender, main backgroup
my friends navigation
code review -  update
code review, ajax join-group request
code review: group find
join group via ajax request
posts list view
user statistic
footer links
empty file
add test data, groups list item view update
fix bug: rating link
deny access for modules
database dump
auto fit width and height of images in posts list
page load time
ui
UI improve