Adding "ImageTools" class, and Alpha Trim fixes

- Added class "ImageTools".
- Added Hossam Hassan's improve borders tweak (in "Image Filters").
- Removing the filtered image (the right picture box) when mouse
clicked.
- Some improvements on the Alpha Trim class and usage: Now you should
pass the image matrix only to the constructor, and pass "sortingType"
object to "removeNoise" method instead, and the display of the image is
now an outer operation.

Note: For some reasons, Hossam's new tweak is not running well, and it
improves the right and bottom borders only.
Merge pull request #4 from chaosagex/Tools-Class

ImageTools & initArray