[xcodeproj] Update to work with prebuilt binaries.
[gemspec] Bump Xcodeproj dependency to 0.14
[CHANGELOG] Update for 0.27
[rake] Temp disable spec run on release, because locally Xcode is failing the examples at the ‘install’ phase.
Release 0.27.0
[rake] Re-enable specs during release, but add env var to disable.
[gemspec] Depend on pure Ruby version of json gem.
[CHANGELOG] Bump to 0.27.1
Release 0.27.1
Update CHANGELOG.md