Cleanup, add commenting, and sanity checking

Added some sanity checking to the linkcheck code, as well as comments.
Changed the inline regex instantiation to finals with names that make
more sense on what exactly the regex is for.
Merge pull request #15 from Term1nal/term1nal

Cleanup, add commenting, and sanity checking
Don't ignore pubspec.lock
Added $leaderboard command and tweaked the green color.
Formatted GitHub Code
Gracefully Handle GitHub requests when the bot isn't connected.
Reformatting
Format Code
Points.get_order => Points.sorted
Rename 'add-karma' to 'give-karma'
Remove lines.txt
Add public and status handling for GitHub
Formatting Fix
Add more events to gh-hooks adding.
Fixed GitHub Hook Bugs
GitHub Rate Limit
Cleaned up Points System
Bug Fixes
Fix Achievements
Ugh