requirements.txt: remove newrelic

removing newrelic as it complicates redistribution: nonfree software license.
Bump Dockerfile to Saucy

This replacing the EOL Raring install with the
still-yet-supported Saucy release. Saucy is supported
through to July.

This patch addresses the SSL heartbleed vulnerability.
Merge pull request #312 from ewindisch/bleedingheart

Bump Dockerfile to Saucy
Merge pull request #311 from proppy/patch-1

requirements.txt: remove newrelic