build.py: fix nmake
build.py: use absolute path
jenkins.py: fix windows path too long error on testing
Windows: fix shared libraries example
Update README.md

[skip ci]
Update README.md

[skip ci]
build.py: fix python import
build.py: add notes to help
build.py: detect directory by self location
Update README.md

[skip ci]
travis: no need to set POLLY_ROOT environment variable
Merge branch 'develop' into linux