hesthorp

Attempting to build on windows gives: ``` # github.com/heidi-ann/ios/unix go\src\github.com\heidi-ann\ios\unix\persist.go:162: undefined: openWriteAheadFile ```

I now get: ``` # github.com/heidi-ann/ios/unix go\src\github.com\heidi-ann\ios\unix\wal_unsupported.go:22: cannot assign syscall.Handle to file (type int) in multiple assignment go\src\github.com\heidi-ann\ios\unix\wal_unsupported.go:37: cannot use w.fd (type int) as type syscall.Handle in argument to syscall.Write...