change the db change log
Merge pull request #63 from hmunfru/bug/script_migrations

change the db change log
update the resource model for task
change in abstract blueprint to load the environment. Change the way to
obtain the floating ip pool in essex
Merge pull request #67 from telefonicaid/bugs/master

Bugs/master
change user data and some openstack utils
new user data
solve the null exception problem
Merge pull request #70 from telefonicaid/bugs/master

Bugs/master
change userdata
Merge pull request #72 from telefonicaid/bugs/master

change userdata