Update gem dependencies

Gemfile.lock

@@ -7,7 +7,7 @@ GEM
       multi_json (~> 1.3)
       thread_safe (~> 0.1)
       tzinfo (~> 0.3.37)
-    atomic (1.1.15)
+    atomic (1.1.16)
     backports (3.6.0)
     better_errors (1.1.0)
       coderay (>= 1.0.0)
@@ -20,9 +20,8 @@ GEM
     coffee-script-source (1.7.0)
     daemons (1.1.9)
     erubis (2.7.0)
-    ethon (0.6.3)
+    ethon (0.7.0)
       ffi (>= 1.3.0)
-      mime-types (~> 1.18)
     eventmachine (1.0.3)
     execjs (2.0.2)
     ffi (1.9.3)
@@ -34,10 +33,9 @@ GEM
     i18n (0.6.9)
     json (1.8.1)
     method_source (0.8.2)
-    mime-types (1.25.1)
-    mini_portile (0.5.2)
+    mini_portile (0.5.3)
     minitest (4.7.5)
-    multi_json (1.9.0)
+    multi_json (1.9.2)
     nokogiri (1.6.1)
       mini_portile (~> 0.5.0)
     options (2.3.2)
@@ -54,7 +52,7 @@ GEM
     rack-test (0.6.2)
       rack (>= 1.0)
     rr (1.1.2)
-    sass (3.3.3)
+    sass (3.3.4)
     sinatra (1.4.4)
       rack (~> 1.4)
       rack-protection (~> 1.4)
@@ -78,12 +76,12 @@ GEM
       daemons (>= 1.0.9)
       eventmachine (>= 1.0.0)
       rack (>= 1.0.0)
-    thor (0.18.1)
-    thread_safe (0.2.0)
+    thor (0.19.1)
+    thread_safe (0.3.1)
       atomic (>= 1.1.7, < 2)
     tilt (1.4.1)
-    typhoeus (0.6.7)
-      ethon (~> 0.6.2)
+    typhoeus (0.6.8)
+      ethon (>= 0.7.0)
     tzinfo (0.3.39)
     uglifier (2.5.0)
       execjs (>= 0.3.0)