Migrate to golang1.5 release with GO15VENDOREXPERIMENT=1 enabled

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

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+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