Update issue templates

Initial issue templates

Author: dpvc

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Issue Summary
+
+A summary of the issue and the browser/OS environment in which it occurs. If
+suitable, include the steps required to reproduce the bug.
+
+### Steps to Reproduce:
+
+1. This is the first step
+2. This is the second step
+3. Further steps, etc.
+
+Any other information you want to share that is relevant to the issue
+being reported. Especially, why do you consider this to be a bug? What
+do you expect to happen instead?
+
+### Technical details:
+
+* MathJax Version: 2.3 (latest commit: f3aaf3a2a3e964df2770dc4aaaa9c87ce5f47e2c)
+* Client OS: Mac OS X 10.8.4
+* Browser: Chrome 29.0.1547.57
+
+### Supporting information:
+
+ * Please supply a link to a (live) minimal example page, when possible.
+ * If your issue is with the display of the mathematics produced by MathJax, include a screen snapshot that illustrates the problem, when possible.
+ * Check your browser console window for any error messages, and in crude them here.
+ * Include the MathJax configuration you are using, and the script tag that loads MathJax itself.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**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.