Update issue templates

Author: wholmgren

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Versions:**
+ - ``pvlib.__version__``: 
+ - ``pandas.__version__``: 
+ - python:
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/support-question.md

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+---
+name: Support question
+about: If you have a support or usage question, please see the pvlib stack overflow
+  tag or the pvlib-python google group
+
+---
+
+pvlib usage questions can be asked on [Stack Overflow](http://stackoverflow.com) and tagged with the [pvlib](http://stackoverflow.com/questions/tagged/pvlib) tag.
+
+The [pvlib-python google group](https://groups.google.com/forum/#!forum/pvlib-python) is used for discussing various topics of interest to the pvlib-python community. We also make new version announcements on the google group.