compile method of template instance should return itself

[tadatuta]

require('bem-xjst').bemhtml.compile('')
/*
{ apply: [Function: apply],
  compile: [Function: compile],
  BEMContext: { [Function: ContextChild] super_: [Function: Context] } }
*/
require('bem-xjst').bemhtml.compile('').compile('') // undefined

Expected Behavior

compile() method of template instance should return itself

Actual Behavior

returns undefined

[tadatuta]

cc @zxqfox

[qfox]

Yeah, it looks like inconcistency between compiles.
Also, would be nice to have a way to not mutate instance (I thought compile does not). ;-(