Adding english version of bemtree guide
Update bemtree-reference.en.md

Changes made, following Inna's comments and suggestions
doc review
querystrings block russian description
Merge pull request #659 from bem/bemhtml-js-syntax-review

bemhtml-js-syntax: doc review and corrections
Merge pull request #654 from rasulksirov/doc-trans

Adding English version of BEMTREE template engine guide
Merge pull request #660 from bem/issues/#655@v2

query strings block russian description Close #655
Updated `enb` dependencies
Merge pull request #666 from bem/issue-665

Updated `enb` dependencies (WIP)
Correct link on master-class
Merge pull request #675 from bem/correct-link-in-docs

Correct link on master-class
fixed documentation links
apply & applyNext description fix Close #676
Merge pull request #624 from bem/BEMINFO-430

fixed documentation links
Update bemhtml-js-syntax.ru.md
Update bemhtml-js-syntax.en.md
Merge pull request #678 from jk708/v2

Links and misprints fix
links corrected
Merge pull request #679 from bem/bemtree-reference-neige

links corrected
apply & applyNext description fixed