Merge pull request #1 from chadrik/master

Review 1
fixed IP defaults formaya
removed sleep command - already fixed by sending a parameter list rather than individual open commands
changed shell commands to use os.chmod
updated comments, get_from_brush added to load maya files from zbrush
updated class names
added consts for env vars, moved maya commands to zclient.main
added a timeout to lock file check
zclient change merge
updated comments
added constants for env vars, created a single temp localtion
removed the need for 'zbrush_save' functions
simplified zbrush export process
simplified zbrush file export, new GUI for zbrush
updated docs
updated comments
More review notes