[BUGFIX beta] Give precedence to routes with more static segments. Fixes #3573
[BUGFIX beta] reduceComputed ignore changes during reset.

When a chain of `reduceComputed` CPs are invalidated and a downstream CP is
recomputed, ignore any array events from upstream `reset`s.

Fix #3607.
Changelog renamed to .md, initial changes
Changed all releases to headings
[DOC] Add defeatureify to instructions.

[ci skip]
Removed duplicate entry
Merge pull request #3642 from knownasilya/changelog-md

CHANGELOG converted to Markdown
Merge pull request #3641 from rjackson/update_build_instructions

[DOC] Add defeatureify to instructions.
fix link to handlebars helper
Merge pull request #3645 from shime/patch-1

fix link to handlebars helper
Merge pull request #3609 from hjdivad/fix-3607

[BUGFIX beta] reduceComputed ignore changes during reset.
Fixed small typo
Merge pull request #3653 from intuitivepixel/master

Fixed small typo
Made the session variable lowercase.
Merge pull request #3654 from MajorBreakfast/master

Made the session variable lowercase.
Removed nullified duplicate entries in features.json
Merge pull request #3575 from xtian/static-segment-precedence

Give precedence to routes with more static segments. Fixes #3573
[BUGFIX beta] sync router.js

- Sync router.js
- Don't fire `error` actions on transitions that have already been
  aborted/redirected
- Closes #3162
Merge pull request #3658 from machty/routerjs-sync

[BUGFIX beta] sync router.js
[DOC beta] Reference the guide on Feature Flags.

[ci skip]