introduce GitHub API wrapper
update dependencies
update dependencies (rev1)
Now GitHub credentials are read from either json file or environment variables
getting commit sha from issues
update dependencies & change api library from org.kohsuke.github to com.jcabi.github
complete GitHubCrawler.java
implement seliarizer
enable cache
fix commands of git_archive.sh
bugfix: the evaluator of if statement in git_archive.sh was not correct
add new line at the end of file
Merge pull request #14 from tokichie/4_Crawling

Implement repository crawling system. Close #4