Update README.md
Update README.md
Update README.md
Actually report failure from build.sh when a test fails
Merge pull request #842 from realm/tg-test-report-failure

Actually report failure from build.sh when a test fails
Use std::unique_ptr to hold pointers to C++ types

Cuts down on cleanup code and fixes a memory leak when creating a shared
group throws an exception.
Implement read-only realms