Allow rtp paths with spaces on Windows

Suggested by @ikurcubic
Merge pull request #454 from vaibhavsagar/patch-1

Allow rtp paths with spaces on Windows

Fixes #451
Fixes #453
Clarified comment for non GitHub example in Configure bundles
Bump version to 0.10.1
Merge branch 'master' into next
add installation script
update autocmd
finish early if insallation of Vundle failed