add guard

Gemfile.lock

@@ -30,17 +30,59 @@ GEM
     blankslate (3.1.3)
     codeclimate-test-reporter (0.4.6)
       simplecov (>= 0.7.1, < 1.0.0)
+    coderay (1.1.0)
     docile (1.1.5)
+    ffi (1.9.10)
+    ffi (1.9.10-x64-mingw32)
+    formatador (0.2.5)
+    guard (2.13.0)
+      formatador (>= 0.2.4)
+      listen (>= 2.7, <= 4.0)
+      lumberjack (~> 1.0)
+      nenv (~> 0.1)
+      notiffany (~> 0.0)
+      pry (>= 0.9.12)
+      shellany (~> 0.0)
+      thor (>= 0.18.1)
+    guard-compat (1.2.1)
+    guard-minitest (2.4.4)
+      guard-compat (~> 1.2)
+      minitest (>= 3.0)
+    listen (3.0.3)
+      rb-fsevent (>= 0.9.3)
+      rb-inotify (>= 0.9)
+    lumberjack (1.0.9)
+    method_source (0.8.2)
     minitest (5.6.1)
     multi_json (1.11.2)
+    nenv (0.2.0)
+    notiffany (0.0.7)
+      nenv (~> 0.1)
+      shellany (~> 0.0)
     parslet (1.7.0)
       blankslate (>= 2.0, <= 4.0)
+    pry (0.10.1)
+      coderay (~> 1.1.0)
+      method_source (~> 0.8.1)
+      slop (~> 3.4)
+    pry (0.10.1-x64-mingw32)
+      coderay (~> 1.1.0)
+      method_source (~> 0.8.1)
+      slop (~> 3.4)
+      win32console (~> 1.3)
     rake (10.4.2)
+    rb-fsevent (0.9.5)
+    rb-inotify (0.9.5)
+      ffi (>= 0.5.0)
+    shellany (0.0.1)
     simplecov (0.9.2)
       docile (~> 1.1.0)
       multi_json (~> 1.0)
       simplecov-html (~> 0.9.0)
     simplecov-html (0.9.0)
+    slop (3.6.0)
+    thor (0.19.1)
+    win32console (1.3.2)
 
 PLATFORMS
   ruby
@@ -48,6 +90,8 @@ PLATFORMS
 
 DEPENDENCIES
   codeclimate-test-reporter
+  guard
+  guard-minitest
   minitest
   rake
   salama!