Fixed some minor buffer size issues.
Minor type fix.
Added interrupted property to iPhoneStreamer.

The pausedByInterruption ivar has been removed. If you were accessing this then you will need to switch to use the property.

Do note that ivars may change without warning. If you are accessing any other ivar in AudioStreamer then you should switch to properties where possible. Ivars will not get deprecated if renamed or removed and if you find an ivar that you would like to be a property then please open an issue.