message: Added Community drop down and removed links from footer
diff: <li><a routerLink="/project/list" routerLinkActive="active" >Opportunities</a></li>
  <li><a routerLink="/user/list" routerLinkActive="active">Volunteers</a></li>
  <li><a routerLink="/nonprofit/list" routerLinkActive="active" >Nonprofits</a></li>
  + <li>
  + <a materialize="dropdown" class="dropdown-button" data-beloworigin="true" data-hover="true" href='#!' data-activates='dropdowncommunity'>
  + Community<i class="material-icons right">arrow_drop_down</i>
  + </a>
  + <ul id="dropdowncommunity" class="dropdown-content">
  + <li><a target="_blank" href="http://join-our-slack.code4socialgood.org/" class="black-text text-lighten-2">Chat</a></li>
  + <li><a target="_blank" href="http://forum.code4socialgood.org/" class="black-text text-lighten-2">Forum</a></li>
  + <li><a routerLink="/about" routerLinkActive="active" class="black-text text-lighten-2" id ="about">About Us</a></li>
  + </ul>
  + </li>
  <li *ngIf="auth.authenticated()">
  <a materialize="dropdown" class="dropdown-button" data-beloworigin="true" data-hover="true" href="#!" data-activates="dropdownproject">{{auth.getCurrentDisplayName()}}<i class="material-icons right">arrow_drop_down</i></a>
  <div class="container">
  <hr/>
  <div class="row">
  - <div class="col s4 foot-left">
  - <ul>
  - <li><a routerLink="/about" routerLinkActive="active" id ="about"><span>About Us</span></a></li>
  - <li><a target="_blank" href="http://forum.code4socialgood.org/"><span>Forum</span></a></li>
  - <li><a target="_blank" href="http://join-our-slack.code4socialgood.org/"><span>Chat</span></a></li>
  - </ul>
  - </div>
  <div class="col offset-s4 s4 foot-right">
  <ul>
  <li><a href="mailto:info@code4socialgood.org" class="mdi mdi-email mdi-24px"></a></li>
  