Update gems

Gemfile.lock

@@ -24,7 +24,7 @@ GEM
     ethon (0.9.0)
       ffi (>= 1.3.0)
     eventmachine (1.2.0.1)
-    execjs (2.6.0)
+    execjs (2.7.0)
     ffi (1.9.10)
     highline (1.7.8)
     html-pipeline (2.4.1)
@@ -33,12 +33,14 @@ GEM
     i18n (0.7.0)
     json (1.8.3)
     method_source (0.8.2)
-    mini_portile2 (2.0.0)
-    minitest (5.8.4)
-    multi_json (1.12.0)
-    nokogiri (1.6.7.2)
-      mini_portile2 (~> 2.0.0.rc2)
+    mini_portile2 (2.1.0)
+    minitest (5.9.0)
+    multi_json (1.12.1)
+    nokogiri (1.6.8)
+      mini_portile2 (~> 2.1.0)
+      pkg-config (~> 1.1.7)
     options (2.3.2)
+    pkg-config (1.1.7)
     progress_bar (1.0.5)
       highline (~> 1.6)
       options (~> 2.3.0)
@@ -51,8 +53,8 @@ GEM
       rack
     rack-test (0.6.3)
       rack (>= 1.0)
-    rake (11.1.2)
-    rr (1.1.2)
+    rake (11.2.0)
+    rr (1.2.0)
     sass (3.4.22)
     sinatra (1.4.7)
       rack (~> 1.5)
@@ -71,13 +73,13 @@ GEM
       rack (> 1, < 3)
     sprockets-helpers (1.2.1)
       sprockets (>= 2.2)
-    thin (1.6.4)
+    thin (1.7.0)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
-      rack (~> 1.0)
+      rack (>= 1, < 3)
     thor (0.19.1)
     thread_safe (0.3.5)
-    tilt (2.0.3)
+    tilt (2.0.5)
     tty-pager (0.4.0)
       tty-screen (~> 0.5.0)
       tty-which (~> 0.1.0)