Update vendor directory to match expectation of vndr tool

Adds READMEs and enforces vendor is done at repository root

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

vendor/gopkg.in/check.v1/README.md

@@ -0,0 +1,20 @@
+Instructions
+============
+
+Install the package with:
+
+    go get gopkg.in/check.v1
+    
+Import it with:
+
+    import "gopkg.in/check.v1"
+
+and use _check_ as the package name inside the code.
+
+For more details, visit the project page:
+
+* http://labix.org/gocheck
+
+and the API documentation:
+
+* https://gopkg.in/check.v1