Adds Leader Election

Add leader election to handle race conditions at scale. As well as optimizations and handling for run away processes (by improving the handling of contexts).

Prior to race conditions fixes

Prior to introducing code to address race conditions with k8s backend as described in #110

Release prior to removing network address from CIDR ranges

In this version when using a CIDR formatted range, it will assign all addresses in the CIDR.

After this release, both the network address (first address in the CIDR) and the broadcast (last address in the CIDR) are not assigned.

Pre-release before changing CRD namespace

Merge pull request #32 from dougbtv/travis-openshift-build

Updates travis to build Dockerfile.openshift