remove rb-fsevent/rb-inotify from the gemfile

This doesn't work with our current deploy process, so it'll need to be
in devs' local Gemfile for now

Change-Id: Ia918672fac851b132c2e688a27bf9f20555f65c3
Reviewed-on: https://gerrit.instructure.com/6598
Reviewed-by: Ryan Shaw <ryan@instructure.com>
Tested-by: Hudson <hudson@instructure.com>

Gemfile

@@ -84,10 +84,6 @@ group :development do
   gem 'ya2yaml', '0.30'
   gem 'guard'
   gem 'guard-coffeescript'
-
-  # for faster guard filesystem polling on various systems
-  gem 'rb-fsevent' if RbConfig::CONFIG['host_os'] =~ /darwin/
-  gem 'rb-inotify' if RbConfig::CONFIG['host_os'] =~ /linux/
 end
 
 group :redis do