mentors.html: Change mentor page year dynamically

Have the year on the GSoC mentor page change dynamically
based on the current month. If it's past September, the page
will show the next year, otherwise it will show the current year.

Closes coala#706

partials/tabs/mentors.html

@@ -4,7 +4,7 @@
     <div class="col m8 offset-m2">
       <h1 class="fine center">Hello there!</h1>
       <h4 class="light center">
-        We are the mentors for coala in GSoC 2018.
+        We are the mentors for coala in GSoC {{ getGsocYear() }}.
       </h4>
       <h4 class="light center">
         Just drop a message on <a href="https://coala.io/chat" class="bear-link">Gitter</a> -
@@ -42,7 +42,7 @@ <h4 class="light center">
     <div class="col m8 offset-m2">
       <h1 class="fine center">Admins</h1>
       <h4 class="light center">
-        We are the admins for coala in GSoC 2018.
+        We are the admins for coala in GSoC {{ getGsocYear() }}.
       </h4>
       <h4 class="light center">
         Just drop a message on <a href="https://coala.io/chat" class="bear-link">Gitter</a>

resources/js/app.js

@@ -386,6 +386,16 @@
                 self.mentorsList = {}
                 self.adminsList = {}
 
+                $scope.getGsocYear = function() {
+                    var gsocSwitchMonth = 6;
+                    var currentdate = new Date();
+                    if (currentdate.getMonth() >= gsocSwitchMonth) {
+                        return currentdate.getFullYear() + 1;
+                    } else {
+                        return currentdate.getFullYear();
+                    }
+                }
+
                 $http.get('data/projects.liquid')
                     .then(function (res) {
                         $scope.projects = res.data.filter(project => project.status != "completed")