To sum up my last comments ... change your icrontab
entry to be:
/home/myuser/watchDir/ IN_MODIFY,IN_CLOSE_WRITE,IN_CLOSE_NOWRITE /bin/bash /usr/local/bin/runT.sh $@/$#
And the script to be:
#!/bin/bash
source /home/myuser/.bash_profile
mkdir /home/myuser/worked #This is to ensure that that incron is running and executing this script
cd /home/myuser/watchDir/myapp
/home/myuser/.rvm/gems/ruby-1.9.3-p545/bin/bundle install --gemfile /home/myuser/watchDir/myApp/Gemfile
#/home/myuser/.rvm/gems/ruby-1.9.3-p545/bin/rake -f /home/myUser/watchDir/myApp