update ios pullFile to account for the fact that the sim root might not ...

...have the exact version in it

@DylanLacey have a look at this, it's a gotcha of working with sim paths. My iOS SDK version might be '7.0', but the directory might be '7.0.3', or '7.0.3-64', so I changed this to use the directory finder from settings.js, and to throw a warning if there are multiple dirs. Unfortunately this change makes the unit tests rather impractical since it really depends on getting the status of the filesystem, so I added a new functional test and removed the unit tests.
Also verified tests pass now on 6.1, 7.0, and 7.1 with these changes