Added a solver that uses two heuristics
Merge branch 'master' of https://github.com/milseman/sokoban.git
removed output from the pattern generator
Added performance improvements to solver
(no double calculation for heuristic and depth limit)
adapted the gradient builder to work with arbituary positions
Added a solver that uses two heuristics for rating
removed failure
Merge branch 'master' of https://github.com/milseman/sokoban.git

Conflicts:
	src/ai/sokoban/solving/heuristics/LowerBoundHeuristic.java