improved the display position of 'detail_card_info'
* indicator/templates/indicator/SheetDefault.html:
  destroy 'qtip' when close card

* added new app 'apps/sfaccount'
* implemented 'signup' and 'activate' functions
* implemented async sending activation mail
  (using 'django-celery' and 'redis')
* moved 'registration/*' templates to 'sfaccount/templates'

* implemented 'password_change' function:
  o password_change
  o password_change_done
* implemented 'password_reset' function
  o password_reset
  o password_reset_done
  o password_reset_confirm
  o password_reset_complete
  o re-write 'sfaccount.fomrs.SFPasswordResetForm'
  o re-write 'sfaccount.views.password_reset_view'
* improved 'sfaccount.functional' send mail functions
  o to send 'multipart' mail

* added 'README.txt'

* added app 'apps/recommend':
  for comparing with the SCI papers and then recommending
  most related papers for user.

  renamed to 'indicator_fanduf()' due to name conflict
* finished 'search' function for page indicator NewDeleteIndex.html
* added 'apps/utils/search_tools.py': some tools to process search results
* renamed 'sciblog/templatetags/tools.py' to 'get_range.py'
* added 'format_data()' to indicator.tools': to format data of
  record/confine, make it properly display in html page;
* 'indicator/javascripts/new_delete_index.js':
  added global 'var added_indexes_id' to track the already added indexes
* added 'indicator/templatetags/divisible_by.py' filter to check
  if a number can be extactly divide by another number;
* fixed the 'index_card_fir/index_card_sec' problem of
  'act_card_container' of page 'SheetDefault.html'
* indicator/static/css/new_delete_index.css:
  added 'index_search_error' and 'index_error'

* fixed 'unit.dump' problems in 'indicator.models'
* 'indicator.tools':
  o added 'RI_TYPES', 'RI_WEIGHTS'
  o added 'type' in the return value of 'calc_indicator_weight()'
    and 'recommend_indicator()'
* added field 'followedHistories' in 'indicator.models.UserIndicator'
* moved 'follow_indicator()' and 'unfollow_indicator()' from
  'indicator.views' to 'indicator.tools'

TODO:
* highcharts: draw chart for indicator records;
* add/edit data, and submit (page format design)
* followed indicator submit buttion