Refs #34 - Updated changelog
Refs #35 - Removed :doc: directives in README.
Refs #35 - Fixed conversion of README from reStructuredText to HTML.
Refs #26 - Do not compute size of virtual files, unless file wrapper implements was_modified_since().
Refs #26 - Fixed assertIs() compatibility for Python<2.7
Merge pull request #37 from benoitbryon/26-virtual-download-size

Closes #26 - Do not compute size of virtual files, unless file wrapper implements was_modified_since()
Upgraded zest.releaser to version 3.45 (support of VERSION file).
Preparing release 1.2
Back to development: 1.3