update version/date for TW272beta
Merge branch 'master' of https://github.com/ericshulman/tiddlywiki into ericshulman-master

Conflicts:
	js/Version.js
Merge pull request #127 from ericshulman/master

fix IE version detection
Merge pull request #128 from ericshulman/master

update version/date for TW272beta2