ElasticSearch 0.90.11

This is a relevant legacy version to maintain ElasticSearch 0.20.x (Homebrew's existing legacy version) has excessive memory usage on Mac OS X Mavericks, and 1.x.x series versions of ES are not compatible with Tire (a common Ruby adapter.)

The version I'm submitting is a straight copy from the trunk formula's history for ES 0.90.11.