update orbit_cron rake

lib/tasks/orbit_cron.rake

@@ -1,36 +1,11 @@
 namespace :orbit_cron do
   task :install => :environment do
 
-    # Setup environment in crontab
-    cron_env ="#!/bin/bash\n"+
-                      "PATH=#{ENV['PATH']}\n"+
-                      "RUBYLIB=#{ENV['RUBYLIB']}\n"+
-                      "GEM_HOME=#{ENV['GEM_HOME']}\n"+
-                      "GEM_PATH=#{ENV['GEM_PATH']}\n"+
-                      "RUBYOPT=#{ENV['RUBYOPT']}\n\n"
-
     # Email cron job
-    email_cron = "* * * * * cd #{Rails.root.to_s} && bundle exec rake email:deliver_all > /dev/null\n"
+    email_cron="* * * * * /bin/bash -l -c 'source \"$HOME/.rvm/scripts/rvm\" && rvm use default && cd #{Rails.root.to_s} && bundle exec rake email:deliver_all > /dev/null'"
 
-    File.open('lib/tasks/orbit_cron', "w+") do |f|
-      f.write(cron_env + email_cron) 
-    end
+    %x(CRON="#{email_cron}" && (crontab -l; echo "$CRON" ) | crontab -)
 
-    # Check if current crontab is empty
-    if %x(crontab -l).eql? ""
-      %x(crontab #{Rails.root.to_s+'/lib/tasks/orbit_cron'})
-      %x(rm #{Rails.root.to_s+'/lib/tasks/orbit_cron'})
-      puts "\n"
-      puts "Orbit cron jobs installed\n"
-    else
-      puts "\n"
-      puts "============================ Warning! ============================\n"
-      puts "Crontab is not empty!\n"
-      puts "Please edit crontab with command 'crontab -e' and paste the following lines:\n"
-      puts "=================================================================\n"
-      puts cron_env + email_cron
-      puts "=================================================================\n"
-      puts "\n\n"
-    end
+    puts "Cron jobs installed\n"
   end
 end