define semester model
subjects <=> semesters habtm association
post/put bare json
test structure of response json
Merge pull request #41 from iTakeshi/use_bare_json

Use bare json
fine-tune service
add subject/fine-fix app
add tests of services/replace to test
Merge branch 'master' into test-service
fix markup
cope with bare json
remove log
fix service usage
fix unnecessary removal
Merge pull request #42 from endaaman/test-service

Test service
customize bootstrap
update markup
update style
use local font
refactor