Setup build script and move all sources to src/main/java

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Using different build scripts for Smack and aSmack

This is necessary since aSmack is not really compatible with plain Smack yet.

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Setup script to run before build (smack/asmack)

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
README++

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>