Asdoc alpha4

Hello there,

Asdoc-mojo was not working on linux. Some problems with execution permission (issue 25).
Them, I did some refactor on asdoc-mojo too (issue 20).

Add support to for flex 2.0.1 compatibility mode (issue 26).

And, add a error when source folder not found (issue 27).

That’s all folks =D

VELO