Add package add and remove commands to Makefile

CONTRIBUTING.md

@@ -53,9 +53,11 @@ Building Libraries
 * If you have additional dependencies for ``Minio``, ``Minio`` manages its depedencies using [govendor](https://github.com/kardianos/govendor)
     - Run `go get foo/bar`
     - Edit your code to import foo/bar
-    - export GO15VENDOREXPERIMENT=1
-    - Run `govendor remove +vendor` from top-level directory
-    - Run `govendor add +external` from top-level directory
+    - Run `make pkg-add PKG=foo/bar` from top-level directory
+
+* If you have dependencies for ``Minio`` which needs to be removed
+    - Edit your code to not import foo/bar
+    - Run `make pkg-remove PKG=foo/bar` from top-level directory
 
 * When you're ready to create a pull request, be sure to:
     - Have test cases for the new code. If you have questions about how to do it, please ask in your pull request.

Makefile

@@ -50,6 +50,12 @@ genversion:
 	@echo "Generating new minio version.go"
 	@go run genversion.go
 
+pkg-remove:
+	@GO15VENDOREXPERIMENT=1 govendor remove $(PKG)
+
+pkg-add:
+	@GO15VENDOREXPERIMENT=1 govendor add $(PKG)
+
 install: gomake-all
 
 clean: