* updated 'apps/indicator/templates/indicator/' pages,
  extends "base.html", make use of the django template system
* added 'static_url', 'indicator_url' js variables
* implemented the AJAX function for 'apps/indicator/templates/' pages

TODO:
* finish 'indicator.views': get_card_data_chart(), get_card_data_table()
* link the front pages with the django models, forms and search!