add guard-rubocop

Gemfile

@@ -52,7 +52,8 @@ group :development, :test do
   gem "rspec-rails", "~> 3.4.0"
 
   # automatic test runs
-  gem "guard-rspec", require: false
+  gem "guard-rspec",   require: false
+  gem "guard-rubocop", require: false
 
   # preloading environment
   gem "spring"

Gemfile.lock

@@ -106,6 +106,9 @@ GEM
       guard (~> 2.1)
       guard-compat (~> 1.1)
       rspec (>= 2.99.0, < 4.0)
+    guard-rubocop (1.2.0)
+      guard (~> 2.0)
+      rubocop (~> 0.20)
     hashdiff (0.2.3)
     httparty (0.13.7)
       json (~> 1.8)
@@ -286,6 +289,7 @@ DEPENDENCIES
   fixture_builder (~> 0.4.1)
   fuubar (= 2.0.0)
   guard-rspec
+  guard-rubocop
   logging-rails (= 0.5.0)
   nyan-cat-formatter
   pronto (= 0.5.3)

Guardfile

@@ -21,3 +21,8 @@ guard :rspec, cmd: "NO_COVERAGE=true bin/rspec" do
   watch(rails.app_controller)  { "#{rspec.spec_dir}/controllers" }
   watch(rails.routes)          { "#{rspec.spec_dir}/routing" }
 end
+
+guard :rubocop do
+  watch(/.+\.rb$/)
+  watch(/\.rubocop\.yml$/) {|m| File.dirname(m[0]) }
+end