Applies govenor migrate godep

Updates contributing and make file

Removes empty vendor package

Removes go 1.4 logic

CONTRIBUTING.md

@@ -100,11 +100,11 @@ From there, open your fork in your browser to open a new pull-request.
 
 ### Tips for Working on Packer
 
-#### Godeps
+#### Govendor
 
-If you are submitting a change that requires new or updated dependencies, please include them in `Godeps/Godeps.json` and in the `vendor/` folder.  This helps everything get tested properly in CI.
+If you are submitting a change that requires new or updated dependencies, please include them in `vendor/vendor.json` and in the `vendor/` folder.  This helps everything get tested properly in CI.
 
-Note that you will need to use [Godep](https://github.com/tools/godep) to do this. This step is recommended but not required; if you don't use Godep please indicate in your PR which dependencies have changed and to what versions.
+Note that you will need to use [govendor](https://github.com/kardianos/govendor) to do this. This step is recommended but not required; if you don't use govendor please indicate in your PR which dependencies have changed and to what versions.
 
 Please only apply the minimal vendor changes to get your PR to work. Packer does not attempt to track the latest version for each dependency.