++libextobjc to fix ext_copyPropertyAttributes() overflow
In +propertyKeys, make sure to always free 'attributes'
Merge pull request #41 from github/property-keys-memory-management

In +propertyKeys, make sure to always free 'attributes'
First pass at a CONTRIBUTING file
Sign-off line
Rephrasing to emphasize PRs more
Less lawn-yelling
Intro :heart:ing contributions
*couple of guidelines (for the Commonwealth :trollface:)
Merge pull request #43 from github/contributing

First pass at a CONTRIBUTING file
Use -ObjC instead of -all_load for linking unit tests
Merge pull request #47 from github/remove-all-load

Use -ObjC instead of -all_load for linking unit tests
++specta for shared example and teardown improvements
ignore dreaded Desktop Services attribute files
Merge pull request #50 from pizthewiz/ignore-turds

Ignore Desktop Services attribute files
++specta for setup fix
++expecta for memory barrier
Remove talk of Core Data concurrency

It's too contentious, and not really relevant to the larger point being made.
Better phrasing for final paragraph
Merge pull request #54 from github/less-core-data-talk

Remove talk of Core Data concurrency from the README