Merge pull request #46 from leituo56/dev-xiaoli

drop down menu, fix icon link
Merge pull request #47 from leituo56/dev-xiaoli

find_friend function finish
edit files for visualization
Merge pull request #48 from leituo56/sammie_visualization

edit files for visualization
update files only
Merge pull request #49 from leituo56/sammie_visualization

update files only
add icons to filter bar & change when hover (active not done)
Merge pull request #50 from leituo56/dev_jenn2

add icons to filter bar & change when hover (active not done)
commit visualization.html
Merge pull request #51 from leituo56/sammie_visualization

commit visualization.html
add erroFn in site_stat.js
styling for feed page, show and convert timestamp for feed photos, title changes
Merge pull request #52 from leituo56/dev_jenn2

styling for feed page, show and convert timestamp for feed photos
added icons categories (and style) to feed items
Merge pull request #53 from leituo56/dev_jenn2

added icons categories (and style) to feed items
change decimal to percentage
fixed filter icon change color on hover/active issue
Merge pull request #54 from leituo56/dev_jenn2

fixed filter icon change color on hover/active issue
Merge pull request #55 from leituo56/sammie_visualization

Sammie visualization
add stat_visualized.js