Xcode 6 Fixes

• Fix lldb status checking
• Fix AFCFileRef[Read|Write] prototypes
  Incorrect AFCFileRefRead prototype was causing crashes in 64-bit build when reading large files.
• Handle no --args
  When no --args are passed application was started with {args} as argument instead of no argument.
• Fix usage semantic and pair of resource leaks
  AFCConnectionOpen and AFCFIleInfoOpen don't require initialized pointer to pointer to result, but do require corresponding Close calls.
• Arrange callback in read_dir for future use
  Custom callback is called for every file or directory listed on device. This will be used for file download.