Merge pull request #39 from jhamman/feature/github_template

add github pr template

Author: Joe Hamman

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,4 @@
+ - [ ] closes #xxxx
+ - [ ] tests added / passed
+ - [ ] passes ``git diff upstream/master | flake8 --diff``
+ - [ ] whatsnew entry