refactor: separate core code from v4 branch

Author: dpopp07

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Remember, an issue is not the place to ask questions. You can use [Stack Overflow](http://stackoverflow.com/questions/tagged/ibm-watson) for that, or you may want to start a discussion on the [dW Answers](https://developer.ibm.com/answers/questions/ask/?topics=watson).
+
+ Before you open an issue, please check if a similar issue already exists or has been closed before.
+
+**Check service status**
+
+1.  For service issues or 5xx errors, first, go to https://console.bluemix.net/status?tags=platform,runtimes,services&view=n:i and check the status of the service.
+1.  If the service status is OK, continue with a bug report.
+
+---
+
+**Overview**
+_What is the issue? Be concise and clear._
+
+**Expected behavior**
+_What did you expect to happen?_
+
+**Actual behavior**
+_What actually happened?_
+
+**How to reproduce**
+_Help us to reproduce what you experienced. Include your code snippets (without credentials)_
+
+**Screenshots**
+_If applicable, add screenshots to help explain your problem._
+
+**SDK Version**
+_Please provide the SDK version here._
+
+**Additional information:**
+- OS: _for example, iOS_
+- Which version of `Node` are you using?
+
+**Additional context**
+_Add any other details about the problem._

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Remember, an issue is not the place to ask questions. You can use [Stack Overflow](http://stackoverflow.com/questions/tagged/ibm-watson) for that, or you may want to start a discussion on the [dW Answers](https://developer.ibm.com/answers/questions/ask/?topics=watson).
+
+Before you open an issue, please check if a similar issue already exists or has been closed before.
+
+### When you open an issue for a feature request, please add as much detail as possible:
+
+- [ ] A descriptive title starting with the service name
+- [ ] A description of the problem you're trying to solve
+- [ ] A suggested solution if possible

CHANGELOG.md

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+## [3.18.3](https://github.com/watson-developer-cloud/node-sdk/compare/v3.18.2...v3.18.3) (2019-03-19)
+
+
+### Bug Fixes
+
+* expose token manager from core code as a module ([4376e7c](https://github.com/watson-developer-cloud/node-sdk/commit/4376e7c))
+
+## [3.18.2](https://github.com/watson-developer-cloud/node-sdk/compare/v3.18.1...v3.18.2) (2019-03-15)
+
+
+### Bug Fixes
+
+* make `access_token` an allowable query parameter in recognize / synthesize streams ([a2ad09e](https://github.com/watson-developer-cloud/node-sdk/commit/a2ad09e))
+
 ## [3.18.1](https://github.com/watson-developer-cloud/node-sdk/compare/v3.18.0...v3.18.1) (2019-02-14)