v0.3: Asymptote 0.3

There were 17 commits since v0.2.0.
Of those 17, ten commits changed search and evaluation and two are only
speed optimizations. Those ten commits include the following changes (in
no particular order):
  * The Queen is valued more highly now (value of two rooks).
  * The amount of internal iterative deepening in zero window nodes is
    reduced.
  * Knight mobility now excludes squares attacked by enemy pawns.
  * Nullmove pruning is tried more often.
  * The maximum depth for late move reduction is increased.
  * Pawn mobility is considered.
  * Knight and bishops now each have a piece-square table.
  * Isolated pawns are penalized.
  * Captures of the last moved piece are searched deeper.
  * The weighting of knight, bishop and rook mobility has been tuned.