Add new template system for GitHub

.github/ISSUE_TEMPLATE.md

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+### Summary
+
+
+### Environment
+
+- [ ] Operating system : (e.g. Ubuntu Gnome 15.04 64bit)
+- [ ] Web browser : (e.g. Firefox 44.0.2)
+- [ ] Version or revision of Jupyter Notebook : (e.g. 4.1 or 620fb29)
+- [ ] Revision of jupyter-vim-binding : (e.g. 5a057d6)
+
+
+### Behavior
+
+#### Expected
+
+#### Actual
+
+
+### Step by step procedure
+
+1. Start local Jupyter Notebook by `jupyter notebook`
+2. Access http://localhost:8888/
+3. etc.
+
+
+### What you have done to solve the issue
+
+For example, the behavior is confirmed with Firefox 44.0.2 and Google Chrome xx.xx.xx and could not be reproduced in Firefox but Chrome or what ever.
+
+
+### Remarks
+
+If any

.github/PULL_REQUEST_TEMPLATE.md

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+### This PR is for
+
+- [ ] Fix a reported issue : #XXX
+- [ ] Fix a unreported issue : Write summary in a new section
+- [ ] Add a reported feature implement : #XXX
+- [ ] Add a unreported feature implement : Write summary in a new section
+- [ ] Other : Write summary in a new section
+
+### Summary
+
+If any