getCluster api should check for hadoop 2 property first
Merge pull request #89 from aniket486/check_hadoop_2_rm_first

getCluster api should check for hadoop 2 property first
Added GraphiteHistoryWriter - does a lot more detailed app id and metric path sanitization/formation (pig alias based sub paths, etc.)
Reverted HBASE_SEP change
Merge branch 'master' of https://github.com/twitter/hraven

# By Aniket Mokashi
# Via Aniket Mokashi (1) and Vrushali Channapattan (1)
* 'master' of https://github.com/twitter/hraven:
  getCluster api should check for hadoop 2 property first