update development resources

fix tox to test examples again
add detox tox env for faster testing
clean up makefile, add tox target
add extra group for installing dev requirements
clean up contributing doc, build with docs
expand issue template
add pull request template

.github/ISSUE_TEMPLATE.rst

@@ -1,2 +1,33 @@
-The issue tracker is a tool to address bugs.
-Please use the #pocoo IRC channel on freenode or Stack Overflow for questions.
+**This issue tracker is a tool to address bugs in Flask itself.
+Please use the #pocoo IRC channel on freenode or Stack Overflow for general
+questions about using Jinja or issues not related to Jinja.**
+
+If you'd like to report a bug in Flask, fill out the template below. Provide
+any any extra information that may be useful / related to your problem.
+Ideally, create an [MCVE](http://stackoverflow.com/help/mcve), which helps us
+understand the problem and helps check that it is not caused by something in
+your code.
+
+---
+
+### Expected Behavior
+
+Tell us what should happen.
+
+```python
+Paste a minimal example that causes the problem.
+```
+
+### Actual Behavior
+
+Tell us what happens instead.
+
+```pytb
+Paste the full traceback if there was an exception.
+```
+
+### Environment
+
+* Python version:
+* Flask version:
+* Werkzeug version:

.github/PULL_REQUEST_TEMPLATE.rst

@@ -0,0 +1,16 @@
+Describe what this patch does to fix the issue.
+
+Link to any relevant issues or pull requests.
+
+<!--
+Commit checklist:
+
+* add tests that fail without the patch
+* ensure all tests pass with ``pytest``
+* add documentation to the relevant docstrings or pages
+* add ``versionadded`` or ``versionchanged`` directives to relevant docstrings
+* add a changelog entry if this patch changes code
+
+Tests, coverage, and docs will be run automatically when you submit the pull
+request, but running them yourself can save time.
+-->