Fixed vp_kill; in case a child process has delayed
Merge pull request #167 from ichizok/fix-vp_kill

Fix vp_kill
Enable to specify mode characters to vimproc#fopen()
Changed vimproc#fopen() caller argument
Moved string-to-oflag convertion to C code
Changed windows oflags; add leading underscore
Modified vimproc#fopen help description
Fixed missing variable