Add some handy GitHub templates to improve the contribution process

Author: bbatsov

Diff for: CONTRIBUTING.md renamed to .github/CONTRIBUTING.md

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+*Use the template below when reporting bugs. Please, make sure that
+you're running the latest stable inf-clojure and that the problem you're reporting
+hasn't been reported (and potentially fixed) already.*
+
+*When requesting new features or improvements to existing features you can
+discard the template completely. Just make sure to make a good case for your
+request.*
+
+**Remove all of the placeholder text in your final report!**
+
+## Expected behavior
+
+## Actual behavior
+
+## Steps to reproduce the problem
+
+*This is extremely important! Providing us with a reliable way to reproduce
+a problem will expedite its solution.*
+
+## Environment & Version information
+
+### inf-clojure version information
+
+*E.g. 1.4.0*
+
+### Lein/Boot version
+
+*E.g. Lein 2.6.1* (skip this when you didn't use Lein or Boot to start a REPL)
+
+### Emacs version
+
+*E.g. 24.5* (use <kbd>M-x emacs-version</kbd> to check it if unsure)
+
+### Operating system
+
+*E.g. Fedora 23, OS X 10.11 "El Capitan", Windows 10, etc*

Diff for: .github/ISSUE_TEMPLATE.md

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+**Replace this placeholder text with a summary of the changes in your PR.
+The more detailed you are, the better.**
+
+-----------------
+
+Before submitting the PR make sure the following things have been done (and denote this
+by checking the relevant checkboxes):
+
+- [ ] The commits are consistent with our [contribution guidelines][1]
+- [ ] The new code is not generating bytecode or `M-x checkdoc` warnings
+- [ ] You've updated the changelog (if adding/changing user-visible functionality)
+- [ ] You've updated the readme (if adding/changing user-visible functionality)
+
+Thanks!
+
+[1]: https://github.com/clojure-emacs/inf-clojure/blob/master/.github/CONTRIBUTING.md