Attempt the security group API.

Floating IPs API already implemented it seems.
added api builder
Merge pull request #5 from nebula/api-builder

added api builder
Merge pull request #134 from nebula/nebula-release/latest

Add helper api builder for different openstack implementations.  The code is so simple it doesn't need tests; any tests would be exercising the compiler more than it'd exercise the logic.
Place link to godocs in README.
Fix inconsistencies from OpenStack docs
Merge pull request #131 from rackspace/security-groups-api

Attempt the security group API.
Fix null pointer error and FloatingIp struct tag.
Merge pull request #139 from nebula/create_floating_ip_fix

Fix null pointer error and FloatingIp struct tag.
Merge branch 'master' into v0.2.0