ready for flights
Merge branch 'master' of https://github.com/AveryRegier/club-tracker
ignore derby
prep for derby and jooq
basic domain design
cross reference book and section group with immutability after build.
immutable section and group cross-reference.
use an assertion
oops
build section type
extract SectionAdapter
No reward group, refactor test responsibilities.
optimize imports
refactor rewards
organize imports
replace mocks with builders of real objects for books, discoveries, sections, and rewards.
design & refactor