Update main dependencies

Closes #910

Gemfile.lock

 PATH
   remote: .
   specs:
-    paperclip (3.0.3)
+    paperclip (3.0.4)
       activemodel (>= 3.0.0)
       activerecord (>= 3.0.0)
       activesupport (>= 3.0.0)
@@ -11,15 +11,15 @@ PATH
 GEM
   remote: http://rubygems.org/
   specs:
-    activemodel (3.2.3)
-      activesupport (= 3.2.3)
+    activemodel (3.2.5)
+      activesupport (= 3.2.5)
       builder (~> 3.0.0)
-    activerecord (3.2.3)
-      activemodel (= 3.2.3)
-      activesupport (= 3.2.3)
+    activerecord (3.2.5)
+      activemodel (= 3.2.5)
+      activesupport (= 3.2.5)
       arel (~> 3.0.2)
       tzinfo (~> 0.3.29)
-    activesupport (3.2.3)
+    activesupport (3.2.5)
       i18n (~> 0.6)
       multi_json (~> 1.0)
     addressable (2.2.7)
@@ -32,7 +32,7 @@ GEM
       cucumber (>= 1.1.1)
       ffi (>= 1.0.11)
       rspec (>= 2.7.0)
-    aws-sdk (1.4.1)
+    aws-sdk (1.5.2)
       httparty (~> 0.7)
       json (~> 1.4)
       nokogiri (>= 1.4.4)
@@ -78,7 +78,7 @@ GEM
       multi_json (~> 1.0)
       multi_xml
     i18n (0.6.0)
-    json (1.6.6)
+    json (1.7.3)
     launchy (2.1.0)
       addressable (~> 2.2.6)
     libwebsocket (0.1.3)
@@ -88,12 +88,12 @@ GEM
     mime-types (1.18)
     mocha (0.10.5)
       metaclass (~> 0.0.1)
-    multi_json (1.3.2)
-    multi_xml (0.4.4)
+    multi_json (1.3.6)
+    multi_xml (0.5.1)
     net-scp (1.0.4)
       net-ssh (>= 1.99.1)
     net-ssh (2.3.0)
-    nokogiri (1.5.2)
+    nokogiri (1.5.3)
     pry (0.9.9.3)
       coderay (~> 1.0.5)
       method_source (~> 0.7.1)