googlepagination.coffee: use 'this' where applicable

@@ -12,22 +12,22 @@ if casper.cli.args.length == 0
   casper.exit()
 
 processPage = ->
-  casper.echo "capturing page #{currentPage}"
-  casper.capture "google-results-p#{currentPage}.png"
+  @echo "capturing page #{currentPage}"
+  @capture "google-results-p#{currentPage}.png"
 
   # don't go too far down the rabbit hole
   return if currentPage >= 5
 
-  if casper.exists "#pnnext"
+  if @exists "#pnnext"
     currentPage++
-    casper.echo "requesting next page: #{currentPage}"
-    #casper.thenClick("#pnnext").then(processPage)
+    @echo "requesting next page: #{currentPage}"
+    #@thenClick("#pnnext").then(processPage)
     url = @getCurrentUrl()
-    casper.thenClick("#pnnext").then ->
+    @thenClick("#pnnext").then ->
       check = -> url != @getCurrentUrl()
       @waitFor check, processPage
   else
-    casper.echo "that's all, folks."
+    @echo "that's all, folks."
 
 casper.start 'http://google.fr/', ->
   @fill 'form[action="/search"]',  q: casper.cli.args.join(' '), true