v1.4.0

Fixes:

• Potential OutOfMemoryException due to overflow arithmetic errors in TiffReader (@dusan-rychnovsky drewnoakes/metadata-extractor#167)
• Off-by-one error in IptcReader when last tag in data was one byte in length (@cshclm drewnoakes/metadata-extractor#172)

Features:

• Massive expansion of support for Olympus makernotes and RAW (@kwhopper #44 #45 #46 #47)

Testing:

• Added a long-running test that mutates valid Exif (JPEG APP1) segments to try and get ExifReader to throw an exception. Mutating every byte through 0x00-0xFF, and parsing. So far no errors have been uncovered, and this just serves as a reassuring observation.