Add an index on name column of Board

ea5383016a318092920931c6e3e49964fa36956f actually didn't add an index on
name.
Avoid using class variables
Replace verbose unless nil check statements with if
Use bang methods to change content of the object
Exclude generated files from RuboCop
Merge pull request #14 from yous/patch-rubocop

Progress
Merge pull request #16 from yous/patch-board-index

Add an index on name column of Board
Refactor LocoTerm as Modules
Fix rubocop offenses
squash get_cred function into process