Merge pull request #1090 from bem/issues/355@v2

attach: don't use BEMHTML in js
Attach works wrong in theme simple

closes #1076
Merge pull request #1091 from bem/issues/1076@v2

Attach is not properly cleared on cancel of file choosing in Chrome
block tabs
tabs: add theme islands
tabs: bh template
changeTab method and spec tests
PR comments improvement
examples + minor corrections
only one tab can be selected (check)
only one tab can be checked + always create box
check if the box exists when change active tab
Merge branch 'tabs' of github.com:sipayRT/hackaton into tabs
review fixes