add azure provider
azure logo and add backend
azure logo
add azureuser in common usernames
list machines for azure
make list nodes more robust in azure
Merge branch 'staging' into azure

Conflicts:
	src/mist/io/static/css/providers.css
	src/mist/io/static/js/app/views/backend_add.js
sprite
disable tags for Azure nodes
fix reboot/destroy for Azure
fix start/stop for Azure
add create node for Azure and show non Windows images on list_images for Azure
pass node objects and not strings on azure create_node
pass secret as temp file for connect provider, also add post_create_steps for Azure
Add field for uploading azure certificate
Fix css
fix connect provider and associate_key for Azure
improvde Azure images listing
fix Azure image listing
add azure_post_create_steps for Azure node deployments