Remove FFT imglib1 methods for imglib2 ones.
Substitute imglib1 dependency by imglib2 ones.
POM: remove Stitching dependency and add imglib2-ij one.

The Stitching-depending method is unused and consequently not longer needed and the imglib-ij is necessary to use ImageJ functions.
Merge branch 'master' into remove-imglib1-deps

Clean the pom to make use of ImgLib2 methods and remove dependencies from ImgLib1 and Stitching.
In FeatureStack.java, reorganize imports accordingly.

Conflicts:
	pom.xml
	src/main/java/trainableSegmentation/FeatureStack.java
Make release 2.1.1.

Main changes: remove depdencency from imglib1 and Stitching libraries.
Merge pull request #3 from fiji/remove-imglib1-deps

Remove imglib1 deps