New demo application: nqueens
Removed some unnecessary things and added better commentaries
Deleting a wrongly-added file =P
Improved version of the nqueens (more like the X10 one).

Main modifications:

1) the copying of the remote vector has been moved out of the main loop
in nqSearch();
2) got rid of vector<int> - opted for using a Board class, more like
the X10 example (thanks bholt for the ideas).
Yet another nqueens improvement.

Eliminated the local copies of the board as suggested by bholt.

An issue that appeared is how to keep track of the multiple copies that
are being passed to remote nodes. For now, an explicit reference
counter is being used.
Cleaned the code a little bit + better encapsulation
Source file renamed
Merge pull request #188 from baldas/nqueens-demo

New demo application: nqueens