refactored run_sstable2json and run_json2sstable to use file handles rather than paths
add arch check to win req function
Merge pull request #134 from josh-mckenzie/fixWindowsArchMismatch

add arch check to win req function
Merge pull request #133 from kishkaru/master

Refactored run_sstable2json and run_json2sstable to use file handles