Update project dependencies - 2015

[whitews]

Update project dependencies including Django, Django REST Framework, AngularJS, Bootstrap, d3, and jQuery.

Current versions -> target versions:
Django 1.7.7 -> 1.8.2
DRF 2.3.13 -> 3.1.3
AngularJS 1.2.18 -> 1.4.1
Bootstrap 3.1.1 -> 3.3.5
d3 3.4.13 -> 3.5.5
jQuery 1.9.2 -> 2.1.4