update Gopkg.toml, use new version of dep, update vendored files

Gopkg.lock

Gopkg.toml

vendor/github.com/beorn7/perks/.gitignore

vendor/github.com/beorn7/perks/README.md

vendor/github.com/beorn7/perks/quantile/bench_test.go

vendor/github.com/beorn7/perks/quantile/example_test.go

vendor/github.com/beorn7/perks/quantile/exampledata.txt

vendor/github.com/beorn7/perks/quantile/stream_test.go

vendor/github.com/cloudfoundry-community/go-cfenv/.gitignore

...or/github.com/cloudfoundry-community/go-cfenv/.travis.yml

vendor/github.com/cloudfoundry-community/go-cfenv/README.md

...b.com/cloudfoundry-community/go-cfenv/cfenv_suite_test.go

.../github.com/cloudfoundry-community/go-cfenv/cfenv_test.go

...b.com/cloudfoundry-community/go-cfenv/environment_test.go

...github.com/cloudfoundry-community/go-cfenv/envmap_test.go

vendor/github.com/garyburd/redigo/.travis.yml

vendor/github.com/garyburd/redigo/README.markdown

...r/github.com/garyburd/redigo/internal/commandinfo_test.go

vendor/github.com/garyburd/redigo/redis/conn.go

vendor/github.com/garyburd/redigo/redis/conn_test.go