Added default value to exportName option of bemhtml api
Added `bemtree` test
Fixed `gitignore`
Added `async` option to bemhtml api
Fixed `bemhtml` tech: set async option as `false`
Added `_getOptions` method to `bemhtml` tech
Added `bemtree` tech
Fixed test for `bemtree` tech: use `bemtree` tech instead of `bemhtml`
Added doc for `bemtree` tech
Merge pull request #10 from enb-make/feature/bemtree-tech

bemtree tech