Updated README.md
Merged `nodes` & `pseudo-levels` plugin
Moved `inlineBemjson` condition to `plugin`
Renamed `plugin` dir to `plugins`
Renamed `processBemjson` option to `processInlineBemjson`
Moved `builder` to `pseudo-levels` plugin
Simplified code
Added jsdocs
Added `examples` & `inline-examples` emits