Added github issue and PR templates

.github/ISSUE_TEMPLATE.md

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+FOR FEATURES:
+
+Describe the feature you want and your use case.
+
+FOR BUGS:
+
+Describe the problem and include the following information:
+
+- Packer Version
+- Host platform
+- Debug log output from `PACKER_LOG=1 packer builde template.json`.
+  Please paste this in a gist https://gist.github.com
+- The simplest example template and scripts needed to reproduce the bug.
+  Include these in your gist https://gist.github.com

.github/PULL_REQUEST_TEMPLATE.md

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+Describe your change.
+
+Use the following checklist to see when you're ready to merge (for docs-only changes you can skip this).
+
+- [ ] For bugs, your first commit should be a test that reproduces the bug.
+  This test should fail.
+- [ ] Implement the change
+- [ ] Add unit tests as appropriate
+      Example: builder/virtualbox/common/ssh_config_test.go:19
+- [ ] Add an acceptance test with a template example using your feature
+      Example: post-processor/compress/post-processor_test.go:153
+- [ ] Verify that tests pass
+- [ ] For features, update / add documentation under `website/`
+- [ ] Format your code with `go fmt`
+- [ ] Rebase onto master
+- [ ] If your PR resolves other open issues, indicate them below
+
+Closes #xxx
+Closes #xxx