v1.4.7

closes fsnotify#222

[ci skip]

global: switch to x/sys/unix

The syscall package is locked since 1.4[1], all new changes are in x/sys[2]
The fixes for epoll/arm64 are going to be loaded to x/sys/unix. This
commit is straightforward search/replace with a couple of hand edits.

This is needed for fixing fsnotify#130

[1] https://golang.org/s/go1.4-syscall
[2] https://godoc.org/golang.org/x/sys/unix

closes fsnotify#135

Update Travis config to Go 1.5.4 and 1.6.1

Fix golint errors in windows.go for fsnotify#116

closes fsnotify#121
fixes fsnotify#116

kqueue: fix Remove-logic

`os.Lstat` does not return `error` when a file/directory exists,
so the code path  to check for newly created files after a REMOVE
on BSD was never executed.

Also, if the watched entry is a file, it has been removed from the watcher, so do a new-file-check for them as well.

This commit fixes issues on TextMate on OS X and others that uses `exchangedata` to do atomic saves.

See fsnotify#17. closes fsnotify#111.