Starting to work on file listing/fetch

and deleting and simplyfing a bunch of junk in the process
Stubbing in the S3 storer and related options
Starting to adjust paths to match Travis convention

plus having the bucket also configured at server start time.
Using correct PUT/GET path, rearranging some Artifact type stuff
Starting to fill in the metadata storage bits
Plugging in S3 store/fetch and a bit more with metadata
Dumping test server output in integration suite in one other place
Adding AWS creds and such for the integration test
Simplifying schema, moving schema related things around a bit
A smidge more metadata/schema adjustment
Introducing `cli`, renaming package per new location
Trying to unbork the integration test
Updating AWS creds
Pre-setting S3 options from same env keys as the client
Filling in more of the metadata storage bits
Wrapping up first round of metadata storage and retrieval
Replacing homegrown request logging with negroni + logrus
Merge pull request #2 from hamfist/s3-proxying-plus-metadata

S3 proxying & metadata in postgres