Merge pull request #32 from lawinslow/master

Move permission sensitive executables to `exec` directory
Merge pull request #33 from lawinslow/master

Fixed file issue with running on a Mac
Merge pull request #35 from lawinslow/master

Proper version info.
added major version check 4 darw
default dt=3600,nsave,subdaily
Merge pull request #38 from jread-usgs/master

added major version check 4 darwin