general tools for used in other apps
* moved 'templatetags' from 'apps/indicator' to 'apps/utils'
* '.gitignore' to ignore 'fixtures_bak'
* moved js plugins from 'apps/indicator/static/plugins' to
  'staticfiles/plugins'

apps/recommend:
* updated 'recommend.models';
    o commented 'recommend.models.ResearchCombination' (not used)
* implemented views 'add_edit_blog_info' and 'ajax_add_edit_configs';
* added pages 'templates/recommend/add_edit_blog_info.html',
    'add_edit_blog_info_error.html';
    o related css and javascripts files
* added 'tools.py';

* added 'utils/tools.py' for placing generic functions;
* deleted 'initial_data.json' (mv 'fixtures' to 'fixtures_bak');
* small fixes to 'indicator.models', 'sciblog.models' and
  'sfaccount.views'

* fixed automatically show 'proper_nouns' annotation in blog:
  recovered the line 'import signals' in 'sciblog.models'
* added 'is_ok()' method for 'recommend.models.ResearchConfig';

  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