v1.8.1.2 pre

- Fixes #28 Sigma parsing error
- Format now determines jpeg/jpg & tiff/tif files
- Touches #18 Hopeful fix.
Further attempt at protecting the Save method
Swapping out for Semaphore Slim
Fixing rounding issue
Remove unnecessary Image.Tag property use
Cleanup now searches from parent directory
v1.8.2 & v3.0.1

Fixes #28
Fixes #18