Fix infinite loop when waiting for motion status

[fotiDim]

This PR fixes a very important issue. I had an infinite loop when I was waiting for motion status. I noticed this accidentally in my app's last version. This used to work and I am not sure what broke it (iOS 9 or some other change in the library) but it should work fine after merging this.

[nickoneill]

Hey @Navideck-fotis, thanks for reporting this. Does this occur whenever you request motion or just in some unusual cases?

[fotiDim]

It happens every time. I guess nobody else tested motion or maybe they overlooked it.

As an additional safety measure maybe we could add a timeout to the waiting loop.

[fotiDim]

@nickoneill any updates on this?

[nickoneill]

I have a day scheduled for open source work early next week, I'll make all these changes and a new release then.

[fotiDim]

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