Set correct `virtualHW.version` for Windows 2016

This release includes the following changes:

• Set the correct virtualHW.version on OSVersion
• Use ioutil.TempDir to respect OS defaults and TMP and TEMP environment variables on Windows

0.7: Allow 3 digit versions

#148935305

Signed-off-by: Charlie Vieth cviethjr@pivotal.io

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.