add PR and ISSUE templates

.github/ISSUE_TEMPLATE.md

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+* py-evm Version: x.x.x
+* OS: osx/linux/win
+* Python Version (python --version):
+* Environment (output of `pip freeze`):
+
+### What is wrong?
+
+Please include information like:
+
+* full output of the error you received
+* what command you ran
+* the code that caused the failure (see [this link](https://help.github.com/articles/basic-writing-and-formatting-syntax/) for help with formatting code)
+
+
+### How can it be fixed
+
+Fill this in if you know how to fix it.

.github/PULL_REQUEST_TEMPLATE.md

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+### What was wrong?
+
+
+
+### How was it fixed?
+
+
+
+#### Cute Animal Picture
+
+![put a cute animal picture link inside the parentheses]()