Add Ng-Peyton data structures
Replace `build.sh` with `configure`.

Now, PCx is compiling like the most of the others *UNIX programs:

    $ ./configure
    $ make
algumas pequenas modificações
Improve bench.py to fix bugs.

The script options have been improved and some check for erros
have been introduced.

All the tests have been add in the folder `mps` in a compress
format.

The `configure` have been modified to uncompress all the tests.
Some improve in data-structures
Correct installation instructions.