Add templates for PRs and issues (from PyStan)

.github/ISSUE_TEMPLATE.md

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+#### Summary:
+Please provide a short couple sentence summary.
+
+
+#### Description:
+Describe the issue as clearly as possible.
+
+
+#### Reproducible Steps:
+Please report steps to reproduce the issue. If it's not possible to reproduce, please include a description of how you discovered the issue.
+
+If you have a reproducible example, please include it.
+
+
+#### Current Output:
+The current output. Knowing what is the current behavior is useful.
+
+
+#### Expected Output:
+Describe what you expect the output to be. Knowing the correct behavior is also very useful.
+
+
+#### ELFI Version:
+
+#### Python Version:
+
+#### Operating System:
+

.github/PULL_REQUEST_TEMPLATE.md

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+#### Summary:
+
+#### Intended Effect:
+
+#### How to Verify:
+
+#### Side Effects:
+
+#### Successful inference in current Notebook examples:
+
+#### Documentation:
+
+#### Reviewer Suggestions: 
+
+#### Copyright and Licensing
+
+Please list the copyright holder for the work you are submitting (this will be you or your assignee, such as a university or company):
+
+By submitting this pull request, the copyright holder is agreeing to license the submitted work under the following licenses:
+- Code: BSD3 (https://opensource.org/licenses/BSD-3-Clause)
+- Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)