Update version in changelog and readme

add dates to changelog entries

new parsing rules, bug fixes, performance improvements

### Notable changes
- add parsing for iframe.u-*[src] (#116)
- bug fix: reduced implied urls (#117)
- bug fix: don't collapse whitespace between tags
- specify explicit versions for dependencies
- revert BeautifulSoup copying added in 1.1.1 due to bugs (eg #108)
- misc performance improvements

Merge pull request #106 from kartikprabhu/master

new version 1.1.1 - looks good to me

Merge pull request #99 from kartikprabhu/master

Some reorganisation

Cutting a version 1.0.0 release

Fixes #53

changing version number

releasing v0.1.3