Update to Xcode6-Beta7

No breaking changes relevant to the framework, but the examples needed
to be updated.

As always, needs to wait for the beta to be installed on the CI server.
fixed build.sh examples
Merge pull request #861 from realm/jp-beta7

fixed build.sh examples
shared all RealmSwiftExamples schemes
Merge pull request #859 from realm/tg-beta7

Update to Xcode6-Beta7
Add a basic update checker