Adding collections statistics and fixing views

app/assets/javascripts/management.js

app/assets/javascripts/management/colections.js

app/controllers/management/complaints_controller.rb

app/controllers/management/statistics_controller.rb

app/controllers/management/welcome_controller.rb

app/views/management/complaints/index.html.erb

app/views/management/complaints/show.html.erb

app/views/management/statistics/_general_stats.html.erb

app/views/management/statistics/collections.html.erb

app/views/management/statistics/complaints.html.erb

app/views/management/statistics/index.html.erb

app/views/management/statistics/learning_objects.html.erb

app/views/management/statistics/users.html.erb

app/views/management/welcome/index.html.erb