Adding autocomplete for parameters in formula fields, [not complete yet]

https://github.com/podio/jquery-mentions-input

- js libraries
- css file
- change widget, add class

missing:
- add real values, now have default values
- fix a little bug when adding more formula fields
- process data in the post
Query parameters objects and add to the javascript function, so it can
be added to the field formula
Fix a little bug, change "#id_form-TOTAL_FORMS" to the rigth name
i.e. id_initiative_set-TOTAL_FORMS, id_indicator_set-TOTAL_FORMS
Several changes to the target form, specifically to the indicator's part
- Send correctly data in the POST
- no display avatar in formula autocomplete,
- change amount of forms in the formset
- and save first form in the formset with isMain" True
Clean formula data, convert to a string that can undestand eval()
function
Change model data, add main_indicator and delete dummy field 'isMain'

- add MainIndicator model
- add ReportMainIndicator model

- add urls
- add basic views and templates

- modify target form, view and template
- modify period form, view and template
- modify report-perspective and report target, views and templates
fix a little bug, in view report-target, and in target_form
Calculate and save values, and percentage_difference, when submit
period form
- modify formula format
Improve reports view, bar charts, styles, and color signal

- add styles, icons and organizate sidebar

- add lybrary for graphs
- create bar charts

- add templatestags to render color signal, and percentage
- css classes for color signals