Improve connect behavior: 1) connect to any Vim server and get the
required vim runner functions sourced. 2) open a new vim if the server
is not available.
Short name for :filename_escape
make '-f' foreground optional
spawn should not task &blk
quick fix for server connect
[Improve] add client #source method
reverse version bump
remove fesc alias
Merge pull request #19 from zhaocai/master

 Improve connect behavior