Update the changelog for Ember Data 2.7.0-beta.1

CHANGELOG.md

@@ -2,6 +2,31 @@
 
 ### Master
 
+### Release 2.7.0-beta.1 (June 8, 2016)
+- [#4320](https://github.com/emberjs/data/pull/4320) Fixup feature flagging infrastructure.
+- [#4311](https://github.com/emberjs/data/pull/4311) Use property lookup in applyTransforms
+- [#4318](https://github.com/emberjs/data/pull/4318) [FEATURE ds-payload-hooks] Add hooks to map type in payload to modelName
+- [#4378](https://github.com/emberjs/data/pull/4378) [DOC] Add link to PR's for every feature
+- [#4327](https://github.com/emberjs/data/pull/4327) [DOC] Update CONTRIBUTING.md for feature flags
+- [#4389](https://github.com/emberjs/data/pull/4389) call super in addon#init
+- [#4337](https://github.com/emberjs/data/pull/4337) [DOC] Update README.md for improve ES6 syntax in example
+- [#4348](https://github.com/emberjs/data/pull/4348) [CLEANUP ds-finder-include]
+- [#4347](https://github.com/emberjs/data/pull/4347) [CLEANUP ds-references]
+- [#4345](https://github.com/emberjs/data/pull/4345) [DOC] fix example syntax
+- [#4334](https://github.com/emberjs/data/pull/4334) Port the 2.5.x changelog entires to master
+- [#4393](https://github.com/emberjs/data/pull/4393) During normalization, use property lookup instead of hasOwnProp checks
+- [#4363](https://github.com/emberjs/data/pull/4363) [DOC] Fix hard-coded "Customizing Adapters" link
+- [#4350](https://github.com/emberjs/data/pull/4350) [CLEANUP ds-transform-pass-options]
+- [#4374](https://github.com/emberjs/data/pull/4374) Fix #4366: EmbeddedRecordsMixin embeds the record, not the snapshot
+- [#4392](https://github.com/emberjs/data/pull/4392) Fix lint errors caused by merging an older pr
+- [#4396](https://github.com/emberjs/data/pull/4396) Deprecate date parse
+- [#4398](https://github.com/emberjs/data/pull/4398) [FEATURE ds-overhaul-references] Fix inconsistencies with Reference#push
+- [#4399](https://github.com/emberjs/data/pull/4399) Add link to PR of ds-payload-type-hooks feature
+- [#4403](https://github.com/emberjs/data/pull/4403) [BUGFIX beta] Correctly coalesce URI encoded ids
+- [#4405](https://github.com/emberjs/data/pull/4405) [BUGFIX beta] Document the adapterOptions property
+- [#4427](https://github.com/emberjs/data/pull/4427) Update changelog for the 2.6.0 release
+
+
 ### Release 2.6.0 (June 8, 2016)
 - [#4386](https://github.com/emberjs/data/pull/4386) [BUGFIX release] `isUpdating` flag is set correctly for `store.findAll`
 - [#4374](https://github.com/emberjs/data/pull/4374) Fix #4366: EmbeddedRecordsMixin embeds the record, not the snapshot