faster CLI

Imports required for ipy_shell take a long time, so they are moved inside the function call.
For me this change brings down time needed for "starcluster" command from 0.45s to 0.25s.
pep8 fixes to make ./check.py pass
Merge branch 'faster-cli' into develop

closes gh-282
Revert "awsutils: force boto to use latest cacerts file"

This reverts commit 6f26ab5d841f8fb01cd46ba5462be8b1246e3a8c.

Conflicts:
	starcluster/awsutils.py

No longer needed now that boto 2.10.0 is out. Bumped boto dep to 2.10.0
in setup.py
setup: bump paramiko to latest 1.11.0 version
bump version back to development status (9999)
README: add 'Community' section

Points users to the mailing list and IRC channel.
README: update install instructions

Remove 'sudo' prefix from easy_install instructions. Include
instructions for pip.
README: fix typo in downloads URL
cluster: fix bug in Cluster.add_nodes

Needed to also check if Cluster.spot_bid was specified when checking
whether to wait on instances or spot requests to propagate. The spot_bid
kwarg to add_nodes only enables spot if it's not already or overrides
the existing spot bid - it can not disable the global Cluster.spot_bid.

closes gh-284
Calling date --utc to fix default w/o it
Merge pull request #285 from datacratic/date_force_utc

Calling date --utc to fix default w/o it
awsutils: set delete_on_termation when launching instances

In the case of EBS AMIs force the root device to be deleted on
termination of the instance. This prevents misconfigured AMIs from
leaving EBS volumes lying around.

closes gh-225
sshnode: fix keypair validation bug

Needed to set the cluster object's key name to be the same as the node
object in ClusterManager.ssh_to_cluster_node in order for keypair
validation to work properly.
removing @ from security group prefix, adding vpc_id , subnet_id to cluster settings
using private_ip_address when connecting to a vpc node : that's what vpc is about :)
if vpc_id and subnet_id in config args the use a VPCluster otherwise go with Cluster
piping up EasyEc2 to handle vpc mainly adding vpc_id arguments
adding VPCCluster class/ Clustermanager needs to load config file at this moment
adding vpc subnet options to template