[metal-soy-critic] Recursive configuration

[jbalsas]

From Recursive configuration by myself:

Currently, mcritic stops at the first occurrence of a config file. This makes it impossible to override default settings in specific areas of the code. Given the following layout:

• root
  • .soycriticrc.json
  • src
  • test
    • .soycriticrc.json

Soy files within the test folder will be linted using the root configuration rather than by the mix of both.