add graphs by highcharts at top page

- add highcharts
- add tweet-speed graph and tweet-acceleration graph made by highcharts
- add rank_update.js for reload graph and total tweet counts automatically
- modify views.py to get tweet-speed(and etc) data by HTTP GET as json
- modify urls.py to get data as json
Add cron files
modify cron.bak to test automatically starting
change option order in routine.sh
add: tweets are updated automatically

- modify models.py and 0001_initial.py to add tweet_id to model
- modify recent_10tweeet_bs.html to update tweet automatically
- modify urls.py to get newest tweets as json
- modify views.py to get newest tweets as json
- modify rank_update.js to update tweet automatically
Merge remote-tracking branch 'origin/dev_routine' into dev_bootstrap