Changed BUILD_NUMBER to CURATOR_BUILD_NUMBER

To avoid conflicts with existing env var in any setup env (e.g. Jenkins CI)
Merge pull request #68 from untergeek/master

Add get_indices function and cmd-line args
Merge pull request #60 from mohabusama/master

Fix for Issue #58 Added CURATOR_BUILD_NUMBER
Updated CHANGELOG to reflect changes.
Merge pull request #69 from untergeek/show-indices

Updated CHANGELOG to reflect changes.