Add Function as_resize to change desired capacity
Add command resize for ec2.as

For example::
  mico ec2.as resize 10 'apache-*'
Output changes: log and as_ensure
ec2 log:
Add instance type to new instances
Show instance ip when using an existing instance

as_ensure:
Set name as group_name.
Merge pull request #13 from bjuncosa/master

Add AutoScaling resize and output minor fixes