Allow Avizo files to be read as well.

Avizo uses exactly the same format as Amira but the first line starts by Avizo instead of AmiraMesh.
Remove jzlib dependency, now unnecessary.
Merge pull request #3 from fiji/amira-io

Amira io
Merge branch 'master' into amira-io

Conflicts:
	src/main/java/amira/AmiraMeshDecoder.java

The comparison needed to be && to make sure any of the possible starting of lines were not there.