STORM-320: Support STORM_CONF_DIR environment variable to support
alternate location of storm.yaml file.
Expose managed spout ids publicly
fix readme links to point to storm website rather than old wiki
Updated contributor list.
Merge branch 'master' of https://github.com/aaronzimmerman/incubator-storm into storm-337

STORM-337: Expose managed spout ids publicly
Update CHANGELOG and README for STORM-337
Merge branch 'STORM-320' of https://github.com/chu11/incubator-storm into storm-320

STORM-320: Support STORM_CONF_DIR environment variable to support
Update CHANGELOG and README for STORM-320