Fix typos
Fix typos of open() flag

O_SEQENTIAL -> O_SEQUENTIAL
readdir() may crash when FindFirstFileEx() fails
Merge pull request #113 from k-takata/topic/fix-readdir-win32

readdir() may crash when FindFirstFileEx() fails
Merge pull request #112 from k-takata/topic/fix-typo-of-flag

Fix typos of open() flag
Merge pull request #111 from k-takata/topic/fix-typo-in-readme

Fix typos
Improve check windows
Improve expand()
Fix #114 remove GPL code in proc_w32.c and change the license to MIT.