update packaging section in readme

build.spec didn't point to latest version and update link to detailed step-by-step instructions (previous link no longer worked).

bump version and add release notes

bump release branch target

bump version for release

bump version numbers for release

bump versions

update release notes

hotfix chriskiehl#549 - lock down WX version in setup.py due to break…

…ing changes in latest version

only add dock image to non win32 runs