Update dependencies

[wfarner]

Did this mostly to understand the workflow as it relates to govendor. It turned out to be relatively simple (but did resurface some old issues).

Here's the steps i followed:

# internet -> $GOPATH
$ go get -u all

# $GOPATH -> vendor/
$ govendor update +vendor

# Update generated sources, since a third-party API changed (engine-api)
$ make generate

Before i could do this, however, i needed to reset all branches in $GOPATH to master (see #94). IIUC this is merely a relic of godep and should only need fixing once.

[docker-codecov-bot]

Current coverage is 38.51% (diff: 0.00%)

Merging #116 into master will not change coverage

@@             master       #116   diff @@
==========================================
  Files            22         22          
  Lines          1184       1184          
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
  Hits            456        456          
  Misses          686        686          
  Partials         42         42          

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