Extend selfCloseHtmlTags

  * [menuitem](http://www.w3.org/html/wg/drafts/html/master/interactive-elements.html#the-menuitem-element)
  * [track](http://www.w3.org/html/wg/drafts/html/master/embedded-content.html#the-track-element)
Merge pull request #40 from greyevil/master

Extend selfCloseHtmlTags
v2.0.1
jscs version fixed
tParam: should correctly work with `applyBase`
xmlEscape,attrEscape
Merge pull request #44 from Yunnii/master

xmlEscape
Refactor escaping
v2.1.0
Merge pull request #45 from enb-make/tparam1

[WIP] tParam: should correctly work with `applyBase`
attr: consider undefined values
attrs: consider undefined values
match: tests moved to proper place
mod: consider undefined values
mods: consider undefined values
Merge pull request #49 from enb-make/attrs

mod, mods, attr, attrs: Do not ignore undefined values (close #42)
Coverage increase