Deprecate `bem create block`, `bem create elem` and `bem create mod` commands
Deprecate legacy tech modules API
Add warning about tech module API V1
Introduce util.deprecate() function

- use it to output all deprecation warnings
- move deprecation warning of legacy and V1 techs to instance constructors
- mute deprecation warnings in legacy-techs.js and techs.js tests
Use `bem create` command in `make tests` target
Add ability to disable deprecation warning by setting BEM_NO_DEPRECATION=1 environment variable
Changelog for 0.6.10
0.6.10
Merge branch 'release-0.6.10' into deprecate-1.0.0
Release 0.6.x versions with `latest` tag
Port deprecation features from 0.6.x

Merge branch 'support/0.6.x' into release-1.0.0

Conflicts:
	ChangeLog.md
	npm-shrinkwrap.json
	package.json