Update README.md
Fix bug on SSH action
Fix bug on rsync error handling
update credentials examples
Add 'debugger' gem for development
rename client/utils by http_utils
Create domain class and store Item and FloatingIP in it
Allow to specify floating_ip, floating_ip_pool or nothing

Fix #50
Merge pull request #63 from ggiamarchi/issue50

Allow to specify floating_ip, floating_ip_pool or nothing
Merge branch 'master' of https://github.com/ggiamarchi/vagrant-openstack into bug#49
Add tests for #49