Change of mind: bump version to 0.8.0-dev; update docs with plans

Also move ChangeLog.txt to the documentation source tree as whats_new.rst
Remove unused future.hacks package
Update docs
Add example script to upload HTML docs
Add test for issue #4
Fix issue #4: __future__ imports inserted in the wrong place sometimes
Move fix_next fixer to stage 2
Fix issue #5: use fix_raise from python-modernize
Add "What's New" document