Add missing asm-commons to aspectjtools

Add missing asm-commons to aspectjtools

Relates to #117. In commit f986c3d183, the asm-commons dependency became
necessary to pull off the new trick to define classes in arbitrary class
loaders during LTW. The dependency was added to aspectjweaver, but not
to aspectjtools due to an oversight. As aspectjtools is meant to be a
super set of aspectjweaver, add the dependency to the assembly
descriptor.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>