Add callback.pl to handle FB login callback
Add dashboard.pl
Add get_friends_data.pl to handle query FB friends call
Translate birthdate to zodiac names
Draw bar chart with friends data
Merge branch 'feature/front-page' into develop
Transform app to angular app
Add transition and sort to bar chart
Fix Horoscope statistics incorrect error; auto switch app key
Merge branch 'feature/more-chart' into develop
Update bar chart

- add sorting animation
- add sorting color transition
- refactor data processing function
Improve bar chart enter transition
Add basic sunburst chart
Add transition to sunburst chart
Merge branch 'feature/sunburst' into develop
Improve data loading process, prevent duplicate API calls
Add sort option for bar chart
Add sort function to sunburst chart
Modulize page rendering
Modulize header rendering in more pages