remove haml-lint gem

Gemfile

@@ -82,7 +82,6 @@ group :development, :test do
   gem 'faker', '1.3.0' # NOTE '~> 1.4' doesn't work beacause "I18n::InvalidLocale" error, see note for config.i18n in config/application.rb
   gem 'flog'
   gem 'flay'
-  gem 'haml-lint'
   gem 'launchy', '~> 2.1'
   gem 'meta_request'
   gem 'phantomjs', '~> 2.1' # headless webdriver (UI & JS tests)

Gemfile.lock

@@ -215,10 +215,6 @@ GEM
       activesupport (>= 4.1.0)
     haml (4.0.7)
       tilt
-    haml-lint (0.13.0)
-      haml (~> 4.0)
-      rubocop (>= 0.25.0)
-      sysexits (~> 1.1)
     haml_assets (0.2.2)
       haml
       tilt
@@ -468,7 +464,6 @@ GEM
       sprockets (>= 2.8, < 4.0)
     stream (0.5)
     subexec (0.2.3)
-    sysexits (1.2.0)
     therubyracer (0.12.2)
       libv8 (~> 3.16.14.0)
       ref
@@ -541,7 +536,6 @@ DEPENDENCIES
   geocoder (~> 1.1)
   gettext_i18n_rails (~> 1.0)
   haml (~> 4.0)
-  haml-lint
   haml_assets (~> 0.2)
   jquery-tmpl-rails (~> 1.1)
   jruby-openssl