Add support for pgweb in development

This changeset adds support for `pgweb` by installing the executable and
running it as a service. `pgweb` binds to `5433` within the VM and is
exposed to the Vagrant virtual machine host via `15433`.

Attempts to resolve #69.
Forward environment variables for Sauce Labs into VM
Support accessing the test live server (for Sauce Labs)
Add setting to allow LiveServerTestCase address to be changed

SauceConnect needs this to be accessible from more than just localhost
Merge pull request #85 from maurizi/sauce-labs

Forward environment variables for Sauce Labs into VM
Merge branch 'feature/hmc/pgweb' into develop
Add support for Kibana 4

This changeset updates the version of Kibana from 3.x to 4.x. In
addition to the Kibana update, ElasticSearch is now run as its own
service instead of depending on the embedded ElasticSearch inside of
Logstash.

See for more details: https://github.com/azavea/ansible-kibana/pull/2