0.6 fix usage text and create output directory

This release includes:

• Display usage text with flags in lowercase
• If user provides output directory that does not exist, create it

0.5 Fix fseeko64 regression

This includes a change to fix a regression in checking for fseeko64: charlievieth/librsync@ed1128b

0.2: Remove ethernet VMX block

This fixes a field spec not optional error when uploading created stemcells to remote vSphere.

0.1: mac only

Run the program. instructions / dependencies in readme.