Add contribution guidance

Add CONTRIBUTING.md that points to the same document in chef-cookbooks
Add mention of the contribution document in the top of the README.md
Merge pull request #64 from claco/contributing

Merged automatically by jenkins after successful build test
Resolved issue DE257, update l3_agent.ini.erb
Merge pull request #65 from p5ntangle/DE257

Resolved issue DE257, update l3_agent.ini.erb
add ha queues to quantum
Merge pull request #66 from rackerjoe/master

add ha queues for quantum
ha clustering set from rabbitmq settings
fix a syntax error and cut and paste error
Merge branch 'master' of https://github.com/rcbops-cookbooks/nova-network
Merge pull request #67 from rackerjoe/master

Merged automatically by jenkins after successful build test
Fix Hardcoded bridge [DE248]
Merge pull request #68 from hughsaunders/fix_hard_coded_bridge

Merged automatically by jenkins after successful build test
Merge branch 'master' of https://github.com/rcbops-cookbooks/nova-network
remove unused variables
Merge pull request #69 from rackerjoe/master

Merged automatically by jenkins after successful build test
US655: Fixups for Neutron on CentOS

This code installs a new kernel but does nothing to ensure it is
actually running or is the default kernel.  Seems like we will need a
new image running this kernel for exerstack gating.
Merge pull request #70 from invsblduck/us655-centos

Merged automatically by jenkins after successful build test
added logic to set default provider network based on platform
Merge pull request #71 from jacobwagner/dynamic_provider_networks

added logic to set default provider network based on platform
cleanup merge conflicts