Use relative paths in nginx.conf.
Added tests for nginx.conf.
Updated README as `heroku config:add PATH` is no longer needed.

Closes #22.
Prepare for newrelic 3.0.

! Incompatible change in Newrelic 3.0.
  Please update your copy of 04_newrelic.ini from the sample provided.
- Tweaked stock newrelic.cfg.
- NR related scripts and daemon will only run if env var
  `NEW_RELIC_LICENSE_KEY` is defined and that the 3.0 package specific
  `NEWRELIC_VERSION` file exists in /app/local/newrelic.
Bundle PHP newrelic agent extension and deploy on slugc.
Newrelic version: 3.2.5.147.

Closes #8.
Merge branch 'newrelic/3.1' of git://github.com/iphoting/heroku-buildpack-php-tyler

Conflicts:
	README.md
	bin/compile
	conf/nginx.conf.erb
	support/package_newrelic
	support/set-env.sh