bemtree.xjst -> bemtree
Core template's suffix renamed to bemtree
bemtree examples renamed to use .bemtree-suffix
Common level config change to specify bemtree tech renaming
getTech declaration refactoring to specify bemtree tech renaming
bemtree sample bundle refactoring
CHANGELOG fixed
Merge pull request #114 from bem/fix/51@v1

Drop `.xjst` from `.bemtree.xjst` file extension (close #51)