Merge pull request #189 from jaredbischof/master

Enabled accurate download of subset nodes.
Merge pull request #190 from jaredbischof/master

Update to version
Merge pull request #191 from jaredbischof/master

Update to version
Updates and instructions added to shock-server config file.
Spelling error.
Edited index retrieval of Shock nodes to not require fully loading indexes into memory when retrieving a dataset.  Tested and saw improved performance.
Merge