enable file log by default
1. Remove checkpoints field from get  challenge detail api

2. Allow return checkpoints submissions in get submissions API.

3. Add SUBMISSION_TYPE in initizlizers/helper.js
modified log
Update change log in actions/challenges.js
updated actionhero to 8.0.x; converted config.js to separate files
updated config
Active/Past Client challenge costs API

1. Implement the active/past client challenge costs API
TopCoder NodeJS Apply Design Review Opportunity API
TopCoder NodeJS Apply Design Review Opportunity API
Merge pull request #251 from muzehyun/master

Top Track Members API
Submit Design Challenge Submission API Update
num of submissions only counts final.
updated config
merged master
Merge branch 'master' into james-actionhero-upgrade
Update marathon match api

1. Add problemId and prizes field in search marathon match api and get marathon match details api

2. Update related test.
Merge pull request #253 from Ghost141/marathon_api_update

Update marathon match api
Merge pull request #252 from isvisv/master

Submit Design Challenge Submission API Update
merged master
fixed config