Adds Setsize for darwin
move to util, it's not darwin specific
Add Setsize example
Merge pull request #1 from dapplebeforedawn/add-setsize-for-darwin

Add setsize
move `setsize()` back to darwin only
Merge remote-tracking branch 'upstream/master'
add ErrUnsupported for non-Darwin `setsize()`
gofmt
Update README.md
Merge remote-tracking branch 'upstream/master'
use `ErrUnsupported` found in doc.go
Merge remote-tracking branch 'origin/add-setsize-for-darwin'
Merge remote-tracking branch 'origin/master' into setsize-all

* origin/master:
  add generated ztypes_arm.go and ztypes_freebsd_arm.go
  Portable ioctl calls

Conflicts:
	pty_unsupported.go
Add support for setsize on linux and freebsd