fetch the author name when scraping from GitHub
fetch the author name when scraping from GitHub

Test Plan:
ran `PYTHONPATH=. python tools/scrape/scrape.py -s github 200`,
verified author names were there for some of the repos scraped.

Reviewers: spicyj, xymostech

Reviewed By: spicyj

Differential Revision: http://phabricator.benalpert.com/D111

jonafato/vim-awesome,jonafato/vim-awesome,shaialon/vim-awesome,starcraftman/vim-awesome,shaialon/vim-awesome,jonafato/vim-awesome,jonafato/vim-awesome,vim-awesome/vim-awesome,shaialon/vim-awesome,shaialon/vim-awesome,vim-awesome/vim-awesome,divad12/vim-awesome,divad12/vim-awesome,vim-awesome/vim-awesome,divad12/vim-awesome,vim-awesome/vim-awesome,starcraftman/vim-awesome,divad12/vim-awesome,vim-awesome/vim-awesome,starcraftman/vim-awesome,starcraftman/vim-awesome