#31: Now it's possible to run Panza with almost empty config.yml, which means that some parts of panza should be deactivated.
Let user a flexibility to disable Panza components from config.yml by ignoring config blocks issue_repository, code_repository, merge, etc.
Merge pull request #38 from panza-official/issue_31

#31: Now it's possible to run Panza with almost empty config.yml, which ...