Migrate Godeps/_workspace/ to vendor/

vendor/github.com/Sirupsen/logrus/CHANGELOG.md

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+# 0.8.4
+
+formatter/text: fix data race (#218)
+
+# 0.8.3
+
+logrus/core: fix entry log level (#208)
+logrus/core: improve performance of text formatter by 40%
+logrus/core: expose `LevelHooks` type
+logrus/core: add support for DragonflyBSD and NetBSD
+formatter/text: print structs more verbosely
+
+# 0.8.2
+
+logrus: fix more Fatal family functions
+
+# 0.8.1
+
+logrus: fix not exiting on `Fatalf` and `Fatalln`
+
+# 0.8.0
+
+logrus: defaults to stderr instead of stdout
+hooks/sentry: add special field for `*http.Request`
+formatter/text: ignore Windows for colors
+
+# 0.7.3
+
+formatter/\*: allow configuration of timestamp layout
+
+# 0.7.2
+
+formatter/text: Add configuration option for time format (#158)