Merge pull request #1 from dmarcos/master

Bug 928612 - [Gallery] [Camera] Refactoring of exif metadata parser
Bug 947286 - [Exif Parser] Consolidate all global variables in a single one
Merge pull request #2 from dmarcos/bug947286

Bug 947286 - [Exif Parser] Consolidate all global variables in a single one
Bug 983755: various bug fixes in the jpeg.js EXIF writing code
Merge pull request #4 from davidflanagan/bug983755

Bug 983755: various bug fixes in the jpeg.js EXIF writing code
Ignoring invalid segment instead of throwing exception