Add fuci as runtime dependency
also
* include Configurable
* initialize build with branch
Declare defaulting to current_branch
Implement #current_branch and $!_command
No need for Build factory
Get generic branch from repo#branches
Implement Build#status
Delegate some things, add constants for magic strs
Implement Build#log, some refactoring
Implement ::Travis.repo
Implement .repo_name and .origin_repo_command
Make master build type inherit from ::Build
Refactor some things
Add git mixin to classes that need it
Fguire out some requires