Adding development gems + Guardfile for auto-running RSpec tests

Change-Id: I1dcd5fef4f0a382fdc551e6b985fc80ac0cc185e

Gemfile

@@ -8,3 +8,11 @@ group :test do
   gem 'serverspec', '~> 2.24' # Docker 1.8 support
   gem 'specinfra', '~> 2.44' # for Docker backend + send_file & commit (https://github.com/mizzy/specinfra/releases/tag/v2.43.11)
 end
+
+group :development do
+  gem 'travis'
+  gem 'growl'
+  gem 'rb-fsevent'
+  gem 'guard', '~> 2.13'
+  gem 'guard-rspec'
+end

Guardfile

@@ -0,0 +1,17 @@
+# More info at https://github.com/guard/guard#readme
+
+# guard 'rubocop' do
+#   watch(/.+\/.+\.rb$/)
+#   watch(/providers\/.+\.rb$/)
+#   watch(/recipes\/.+\.rb$/)
+#   watch(/resources\/.+\.rb$/)
+#   watch('metadata.rb')
+# end
+
+guard :rspec, cmd: 'rspec', all_on_start: true, notification: true do
+  watch(/^Dockerfile$/)
+  watch(/^spec\/(.+)_spec\.rb$/)
+  watch(/^spec\/helpers\/(.+)\.rb$/)
+  watch(/^spec\/(.+)\/_spec\.rb$/)
+  watch('spec/spec_helper.rb') { 'spec' }
+end