use absolute path for lib
Add $PWD. Fix #1
bin/release: modify lib directory
update bin/release
Revert "Add $PWD. Fix #1"

This reverts commit 2b9ab6bbc4d4470d1df8392e901ce7e091f9ac8b.
escape $PWD
update README
Merge remote-tracking branches 'miyagawa/master', 'islue/master' and 'sugyan/master'