Adding exclude pattern file list param for rsync

As discussed in: vagrant-openstack-provider issue #166
rsync all files #166
Updates based on feedback
Add associated rspec double for rsync_ignore_files
remove rspec tag
Merge pull request #167 from vinsh/issue_166_rsync_param

Adding exclude pattern file list param for rsync

Fix #166
Allow to use several floating_ip_pool
Fix #90
Manage merge operation on floating_ip_pool attribute as an array
Fix #90
Throw error if any floating ip pool permits to allocate a new ip
Fix issue #90
Code review fixes
Fix #90
Merge pull request #161 from simonmazas/issue#90

Fix #90
Code format
Update floating ip pool documentation
basic heat support with create stacks
Implement destroy stack
add config validation for stacks
add README
Add waiting for the server to be deleted