Allow tag attributes with '-' inside

At the moment only attributes with chars/numbers and underscores are possible but html5 data attributes could have a '-' inside.
dbapi #step5
bdapi step6
Revert "dbapi #step5"

This reverts commit 6baaa8480e53e1d09483c108ce201cc5086cf95e.
Revert "bdapi step6"

This reverts commit fd5fd0e76570a6ce2efa1d8126c1c84c0f7807aa.
Merge pull request #73 from yama/master-dmi3yy

Pull requests for 1.0.11
fix getVersionData
Merge pull request #74 from Jako/patch-1

Allow tag attributes with '-' inside
Refactor #10025 Cache documents with $_GET (optional)
lang fix
lang fix
DBAPI in manager - done!
Refactor #10026 SEO Strict URLs (optional)
fix cahe_type and view source tab in document