add html5 feature

- tmdd obj
- _new in XS and add html5 flags
- call mkd_with_html5_tags() if html5
- 13.html5.t
- update document of html5
- update MANIFEST
remove MYMETA files in repo and dist
allow hashref in new
Merge pull request #10 from Songmu/fix/mymeta

remove MYMETA files in repo and dist
Merge pull request #9 from Songmu/feature/enable-html5

add html5 feature
add a test for hashref options in new()
version++
Revert "add a test for hashref options in new()"

This reverts commit e19e949317877e6373d046a7a33f93f17e296d32.
Revert "allow hashref in new"

This reverts commit 028784549cabfc291b4fb4b3900aa04ca43901a9.
Revert "add html5 feature"

This reverts commit 44d717f6b3ae04cbbbbf4ceae5816ecf93e67165.
version++