Adding node version selection to the node deployment (batch script).
Addressing issue #204.
Remove redundant echo.
Fix space.
Renamed:
KUDU_SYNC_COMMAND --> KUDU_SYNC_CMD
KUDU_SELECT_NODE_VERSION_COMMAND --> KUDU_SELECT_NODE_VERSION_CMD
NPM_COMMAND --> NPM_CMD

Also fixed issue in bash script where when the KUDU_SYNC_CMD was set it was still overwritten.
Remove kudu sync command redirect of error stream to null (no error output), this was initially done to avoid getting anoying output lines coming from node due to Antares' sandbox.
Fix exit from function in batch file issue.