CLC-4248 - Update Gems - angular / icalendar / ldap / momentjs / rails

https://jira.ets.berkeley.edu/jira/browse/CLC-4248


CLC-4248 - Update net-ldap
https://github.com/ruby-ldap/ruby-net-ldap/compare/v0.7.0...v0.8.0

CLC-4248 - Update iCalendar
https://github.com/icalendar/icalendar/blob/65a352ad2e076196fc429aba93084560e587c9c8/History.txt#L1

CLC-4248 - Update Rails
http://weblog.rubyonrails.org/releases/
https://github.com/rails/rails/compare/v4.1.5...v4.1.6

CLC-4248 - Update MomentJS
https://github.com/moment/moment/blob/develop/CHANGELOG.md#283

CLC-4248 - Update AngularJS
https://github.com/angular/angular.js/blob/master/CHANGELOG.md#1224-static-levitation-2014-09-09