Minor clean up...

Update:

- if image input = NullBinary() (empty image), no longer raise exception

- FixOrientation: input parameter "orientation" is optional now (was mandatory).

if input parameter "orientation" is empty or "0", orientation will be automatically acquired (only source binary data with EXIF info).

- AddImageWatermark: now has 2 additional output parameters to eliminate the need to raise exception

- success (boolean)

- errormessage (text)

New feature:

Identify new output: bytesize

Get file size of binary data in bytes.

Divide it by 1024 to get file size in kilobytes.