PBJVideoWriter, split out file writing for future undo support and readability, fixes GH-57
Don't hardcode filename
Update PBJVision.m

fix whitespace
Merge pull request #81 from checkthis/master

Don't hardcode video.mp4
PBJVision, don't force the preview layer session to be nil, fixes GH-10
updated podspec v0.1.6