Add Github issue templates

.github/ISSUE_TEMPLATE.md

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+Please make sure you are testing with the latest [release of html2canvas](https://github.com/niklasvh/html2canvas/releases). 
+Old versions are not supported and issues reported for them will be closed.
+
+# Please follow the general troubleshooting steps first:
+
+- [ ] You are using the latest [version](https://github.com/niklasvh/html2canvas/releases)
+- [ ] You are testing using the non-minified version of html2canvas and checked any potential issues reported in the console
+
+<!-- You can erase any parts of this template not applicable to your Issue. -->
+
+### Bug reports:
+
+Please replace this line with a brief summary of your issue **AND** if possible an example on [jsfiddle](https://jsfiddle.net/).
+
+### Specifications:
+
+ * html2canvas version tested with:
+ * Browser & version:
+ * Operating system:

.github/PULL_REQUEST_TEMPLATE.md

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+A similar PR may already be submitted!
+Please search among the [Pull request](https://github.com/niklasvh/html2canvas/pulls) before creating one.
+
+Thanks for submitting a pull request! Please provide enough information so that others can review your pull request:
+
+Before opening a pull request, please make sure all the tests pass locally by running `npm test`.
+
+**Summary**
+
+<!-- Summary of the PR -->
+
+This PR fixes/implements the following **bugs/features**
+
+* [ ] Bug 1
+* [ ] Bug 2
+* [ ] Feature 1
+* [ ] Feature 2
+* [ ] Breaking changes
+
+<!-- You can skip this if you're fixing a typo or adding an app to the Showcase. -->
+
+Explain the **motivation** for making this change. What existing problem does the pull request solve?
+
+<!-- Example: When "Adding a function to do X", explain why it is necessary to have a way to do X. -->
+
+**Test plan (required)**
+
+Demonstrate how the issue/feature can be replicated. For most cases, simply adding an appropriate html/css template into the [reftests](https://github.com/niklasvh/html2canvas/tree/master/tests/reftests) should be sufficient. Please see other tests there for reference.
+
+**Code formatting**
+
+Please make sure that code adheres to the project code formatting. Running `npm run format` will automatically format your code correctly.
+
+**Closing issues**
+
+<!-- Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if such). -->
+Fixes #