Merge pull request #728 from bvssvni/master

Reexport "wire"
Merge pull request #729 from bvssvni/master

Reexported "img_hash"
Merge pull request #731 from bvssvni/master

Reexported "nalgebra"
Merge pull request #733 from bvssvni/master

Reexported "ncollide"
Merge pull request #735 from bvssvni/master

Reexported "astar"
Merge pull request #738 from bvssvni/master

Added dependency graph
Merge pull request #740 from bvssvni/master

Removed unused `sync` dependency
Point img_hash to PistonDevelopers fork