added winston for logging
fetch github archives & insert db
parse patch & insert to db
added scheduling job

* call progressTimeline every hour as github api limit is 5,000
summrize convention score every 30 min
added express front
added routing for fetching github archive
changed css engine to stylus
applied bower to manage clinet components
added flat-ui
added pictonic icons

* refer to <https://pictonic.co/free>
design index page

* using bootstrap
* using flat-ui
* using highlight.js for code highlight
    - <http://softwaremaniacs.org/soft/highlight/en/download/>
    - include C#, HTML, XML, Java, Python, C++, JavaScript, Ruby, CSS,
    PHP, SQL, Clojure, Scala, CoffeeScript, Go, Objective-C, Markdown
added d3.js for chart
fixed progress convention logic & summarizing score
Merge branch 'feature/debug-fetch'
fixed file format for score query
added index to mongodb
added debug logging
using sequential http request to github

* because foreach make too much I/O
* using concurrency batch size
* do not progress in case of github api limited
fixed infinite api call bug