move htmlpage to Page

so template can access htmlpage, it will allow some extractors
do things like creating DOM tree from template htmlpage.
tox+travis-ci+bumpversion+pypi combo
move tests out of main package
I want to be in the list :)
ignore tox dir
Bump version: 0.10.0 → 0.11.0
updated AUTHORS
Fixes #61
Merge pull request #62 from cyberplant/master

Fixes #61
Merge pull request #60 from tpeng/add-htmlpage-to-template

move htmlpage to Page