Start development of 3.0

- Update version number in package.json, publish under "next" tag
 - Add 3.0-DEVELOPING.md describing the process
 - Add 3.0-RELEASE-NOTES.md to incrementally build release docs

3.0-DEVELOPING.md

@@ -0,0 +1,38 @@
+# How to develop LoopBack 3.0
+
+## Keeping track of major and breaking changes
+
+We will need a detailed release notes for 3.0. To make our life easier, we
+should build them incrementally in a file called `3.0-RELEASE-NOTES.md`.
+Each pull request containing a major change must include an update
+of this file describing the change for a user upgrading from 2.x to 3.0.
+
+## Branch setup
+
+Most patches should be landed on the master branch, the new 3.0 release
+will be eventually released from master too.
+
+It is up to the discretion of reviewers to decide which changes to
+back-port from master to 2.x. Initially, we should probably land all bug fixes
+and most backwards-compatible enhancements. This rule should be revisited
+once 3.0.0 was released.
+
+## Publishing pre-release versions
+
+To make it easy for LB developers to test out the upcoming 3.0 version, we
+should regularly publish pre-release versions to npmjs. However, extra care
+must be taken to ensure "npm install" keeps downloading the current 2.x series.
+
+When 2.x branch was created, we have changed package.json on the *master*
+branch and
+
+ 1. changed the version string to `"3.0.0-alpha.1"`
+ 2. added the following bit: `"publishConfig": { "tag": "next" }`
+
+Whenever making a new pre-release version, increment the latest number:
+`3.0.0-alpha.2`, `3.0.0-alpha.3`, etc. Once get closer to the release date,
+we can release `3.0.0-beta.1`, possibly also `3.0.0-rc.1`.
+
+The benefit of this version scheme is that module consumers can use carrot
+operator to get automatic updates: `"^3.0.0-alpha.1"` matches all versions
+from the previous paragraph.

3.0-RELEASE-NOTES.md

@@ -0,0 +1,6 @@
+# List of notable changes made between 2.x and 3.0
+
+All breaking changes must be described here. When adding a new entry,
+always describe the impact on users and instructions for upgrading
+applications from 2.x to 3.0.
+

package.json

@@ -1,6 +1,7 @@
 {
   "name": "loopback",
-  "version": "2.26.2",
+  "version": "3.0.0-alpha.1",
+  "pubishConfig": { "tag": "next" },
   "description": "LoopBack: Open Source Framework for Node.js",
   "homepage": "http://loopback.io",
   "keywords": [