RA->Researcher + add s to alumni section

_includes/alumni.html

@@ -6,7 +6,7 @@
   {% assign id = group.name | replace:' ','-' %}
   <div class="panel-heading">
     <h6 class="panel-title">
-      <a data-toggle="collapse" href="#{{id}}" style="color:black">{{position}} ↯</a>
+      <a data-toggle="collapse" href="#{{id}}" style="color:black">{{position}}s ↯</a>
     </h6>
   </div>
 

_people/bodin.md

 ---
 firstname: Martin
 lastname: Bodin
-position: Research Associate
+position: Researcher
 webpage: https://www.doc.ic.ac.uk/~mbodin
 email: m.bodin@imperial.ac.uk
 github:

_people/cerone.md

 ---
 firstname: Andrea
 lastname: Cerone
-position: Research Associate
+position: Researcher
 github: acerone85
 alumnus: true
 projects:

_people/d-osualdo.md

 ---
 firstname: Emanuele
 lastname: D'Osualdo
-position: Marie-Curie Fellow
+position: Researcher
 webpage: http://www.emanueledosualdo.com/
 email: e.dosualdo@imperial.ac.uk
 github: bordaigorl

_people/fragoso-santos.md

 ---
 firstname: José
 lastname: Fragoso Santos
-position: Research Associate
+position: Researcher
 webpage: http://web.ist.utl.pt/jose.fragoso/
 email: jose.fragoso@tecnico.ulisboa.pt
 github: j3fsantos

_people/maksimovic.md

@@ -2,7 +2,7 @@
 firstname: Petar
 lastname: Maksimović
 search_lastname: Maksimovic
-position: Research Fellow
+position: Researcher
 webpage: https://sites.google.com/site/petarmaksimovic1981/
 email: p.maksimovic@imperial.ac.uk
 github: PetarMax