Release 0.7

Redqueen v0.7 release

1) Fixed bug at time management code. It was preventing Redqueen to play correctly using incremental TC. Reported by Ingo Bauer. Thanks!
2) Transposition table code was refactored;
3) Aspiration window code was improved;
4) Implemented Pawn on 7th rank extension;
5) Clean up on search code;
6) Search code was changed to use "fail-soft" framework;
7) Minor improvement on pawn & king move generator;
8) Changed piece material values;
9) Fixed bug at zobrist hashing code;
10) Fixed bug at function which verify legality of moves retrieved from hash;