Add local fork of meteor-reactive-cache package

- Clone @wekanteam/meteor-reactive-cache to npm-packages/
- Add .meteorignore to exclude npm-packages from Meteor
- Update package.json to use local file path

This allows direct modification of the package for Meteor 3.0
async migration while maintaining publishability to npm.

npm-packages/meteor-reactive-cache/RELEASE.md

@@ -0,0 +1,14 @@
+# Steps to release
+
+## 1. Update these for new version info
+
+- package.json: updated dependencies and new version info
+- package-lock.json: updated dependencies and 2x new version info
+- CHANGELOG.md: Newest changes and new version info
+- Optionally: source code at src/ directory
+
+## 2. Release new version number
+
+```
+./release.sh 1.0.5
+```