Add /api/stats endpoint and github org stats generation

[bobheadxi]

I have some things in mind for the website

type OrgStats struct {
	Repositories int            `json:"repositories"`
	Stargazers   int            `json:"stargazers"`
	Topics       map[string]int `json:"topics"`
	Languages    map[string]int `json:"languages"`

	CommitTotal int               `json:"commit_total"`
	CommitGraph map[time.Time]int `json:"commit_graph"`
}

Sneak peek:

Pending #87

[coveralls]

Coverage decreased (-3.01%) to 37.247% when pulling a6fff54 on gh-stats into aa209cf on master.

[bfbachmann]

Nice work! Can we hold off on merging this until master is stable again? I'd rather not put fresh code on top of a broken branch.

[bfbachmann]

This looks okay, but we'll have to be careful about how we represent the Topics and Languages information on the front end, as we're counting the number of times each topic and language is used and we don't want to confuse that with the number of distinct topics and languages we use.

[bobheadxi]

Yeah, I'm still considering various visualization options - I might not even include some of this in the website quite yet, since our repositories are typically pretty lacking as far as Topic tags go. I was thinking a distinct language count, as well as some sort of word cloud thing with our most popular languages/topics.

[bfbachmann]

I really like the idea of showing off all the programming languages we use.

[bobheadxi]

Yep, I'll hold off on merging this as I work on the website - I'll keep trying to tackle what's going on with master as well (not much progress on that front unfortunately)

[bobheadxi]

with rocket2 up-and-coming, should be fine to just have this merged