Stage dylibs in 'calabash-dylibs'

calabash.dylibs is a confusing name because it is confusing; there
is no .dylibs directory naming convention on MacOS.
Check for 'install lib' script name

We need this test to pass against the released toolchain
as well as the 'master' toolchain, but the script names
are different.
Log pass/fail of calabash-ios gem scripts