Automatic labeling of issues (keras-team#139)

* Test issue template

* Correct field name

.github/ISSUE_TEMPLATE/a--image.md

@@ -0,0 +1,17 @@
+---
+name: a) Issues related to images
+about: Select this if your issue is related to images (default).
+labels: image
+---
+
+Please make sure that the boxes below are checked before you submit your issue.
+If your issue is an **implementation question**, please ask your question on [StackOverflow](http://stackoverflow.com/questions/tagged/keras) or [on the Keras Slack channel](https://keras-slack-autojoin.herokuapp.com/) instead of opening a GitHub issue.
+
+Thank you!
+
+- [ ] Check that you are up-to-date with the master branch of keras-preprocessing. You can update with:
+`pip install git+git://github.com/keras-team/keras-preprocessing.git --upgrade --no-deps`
+
+- [ ] Provide a link to a GitHub Gist of a Python script that can reproduce your issue (or just copy the script here if it is short).
+
+

.github/ISSUE_TEMPLATE/b--text.md

@@ -0,0 +1,17 @@
+---
+name: a) Issues related to NLP
+about: Select this if your issue is related to natural language processing (NLP).
+labels: text
+---
+
+Please make sure that the boxes below are checked before you submit your issue.
+If your issue is an **implementation question**, please ask your question on [StackOverflow](http://stackoverflow.com/questions/tagged/keras) or [on the Keras Slack channel](https://keras-slack-autojoin.herokuapp.com/) instead of opening a GitHub issue.
+
+Thank you!
+
+- [ ] Check that you are up-to-date with the master branch of keras-preprocessing. You can update with:
+`pip install git+git://github.com/keras-team/keras-preprocessing.git --upgrade --no-deps`
+
+- [ ] Provide a link to a GitHub Gist of a Python script that can reproduce your issue (or just copy the script here if it is short).
+
+