Fixed Negative capturedVideoSeconds Bug

In PBJVision.m, I added an if statement to handle situations where the method capturedVideoSeconds was returning a negative value.
This situation had prevented my multi-view application from recognizing that new video was being captured on a return visit to a view that recorded video.
_focusEnabled should check both auto and continuous
Check if DLog is defined before defining it to avoid warnings/conflicts

Signed-off-by: Jai Govindani <jai@zodio.com>
Merge pull request #123 from zodio/master

Check if DLog is defined before defining it to avoid warnings/conflicts
PBJVision, ensure we're not adding nil pointers
PBJVision, remove restore format
remove duration from new offset buffer
PBJVision, minor cleanup, moved a method
PBJVision, added maximumCaptureDuration property
 - delegate callback will be triggered when maximum is met or exceeded
Merge pull request #122 from eliotw1/fix-video-timestamp-error

Fixed Negative capturedVideoSeconds Bug
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