Remove jquery.history.js plugin

We're not concerning ourselves with non-HTML5 browser compatibility, and
this removes 21 KB from our compiled JavaScript.

Bonus fix: There was an extra space after the query string in the URLs
that has now been removed.

app/assets/javascripts/application.js.coffee

@@ -10,7 +10,6 @@
 #= require jquery.cookie
 #= require jquery.endless-scroll
 #= require jquery.highlight
-#= require jquery.history
 #= require jquery.waitforimages
 #= require jquery.atwho
 #= require jquery.scrollTo

app/assets/javascripts/issues.js.coffee

@@ -54,7 +54,7 @@
     form = $("#issue_search_form")
     search = $("#issue_search").val()
     $('.issues-holder').css("opacity", '0.5')
-    issues_url = form.attr('action') + '? '+ form.serialize()
+    issues_url = form.attr('action') + '?' + form.serialize()
     $.ajax
       type: "GET"
@@ -65,7 +65,7 @@
       success: (data) ->
         $('.issues-holder').html(data.html)
         # Change url so if user reload a page - search results are saved
-        History.replaceState {page: issues_url}, document.title, issues_url
+        history.replaceState {page: issues_url}, document.title, issues_url
         Issues.reload()
       dataType: "json"

app/assets/javascripts/merge_requests.js.coffee

@@ -16,7 +16,7 @@
     form = $("#issue_search_form")
     search = $("#issue_search").val()
     $('.merge-requests-holder').css("opacity", '0.5')
-    issues_url = form.attr('action') + '? '+ form.serialize()
+    issues_url = form.attr('action') + '?' + form.serialize()
     $.ajax
       type: "GET"
@@ -27,7 +27,7 @@
       success: (data) ->
         $('.merge-requests-holder').html(data.html)
         # Change url so if user reload a page - search results are saved
-        History.replaceState {page: issues_url}, document.title, issues_url
+        history.replaceState {page: issues_url}, document.title, issues_url
         MergeRequests.reload()
       dataType: "json"