mod gitignore for _build dir, add other doc dirs
Merge pull request #8 from yangzetian/doc-setup

mod gitignore for _build dir, add other doc dirs
add directory `data` and `icon` while building windows exe file
Merge remote-tracking branch 'upstream/master' into windows_building

* upstream/master:
  mod gitignore for _build dir, add other doc dirs
add qimageview module for windows version
Merge pull request #10 from sealhuang/windows_building

add directory `data` and `icon` automatically while building windows exe file