Wasmer

- [565](https://github.com/wasmerio/wasmer/pull/565) Update wapm and bump version to 0.5.6
- [563](https://github.com/wasmerio/wasmer/pull/563) Improve wasi testing infrastructure
- fixes arg parsing from comments & fixes the mapdir test to have the native code doing the same thing as the WASI code
- makes wasitests-generate output stdout/stderr by default & adds function to print stdout and stderr for a command if it fails
- compiles wasm with size optimizations & strips generated wasm with wasm-strip
- [554](https://github.com/wasmerio/wasmer/pull/554) Finish implementation of `wasi::fd_seek`, fix bug in filestat
- [550](https://github.com/wasmerio/wasmer/pull/550) Fix singlepass compilation error with `imul` instruction

- [541](https://github.com/wasmerio/wasmer/pull/541) Fix dependency graph by making separate test crates; ABI implementations should not depend on compilers. Add Cranelift fork as git submodule of clif-backend
- [537](https://github.com/wasmerio/wasmer/pull/537) Add hidden flag (`--cache-key`) to use prehashed key into the compiled wasm cache and change compiler backend-specific caching to use directories
- [536](https://github.com/wasmerio/wasmer/pull/536) ~Update cache to use compiler backend name in cache key~

- [529](https://github.com/wasmerio/wasmer/pull/529) Updates the Wasm Interface library, which is used by wapm, with bug fixes and error message improvements

- [523](https://github.com/wasmerio/wasmer/pull/523) Update wapm version to fix bug related to signed packages in the global namespace and locally-stored public keys

- [516](https://github.com/wasmerio/wasmer/pull/516) Add workaround for singlepass miscompilation on GetLocal
- [521](https://github.com/wasmerio/wasmer/pull/521) Update Wapm-cli, bump version numbers
- [518](https://github.com/wasmerio/wasmer/pull/518) Update Cranelift and WasmParser
- [514](https://github.com/wasmerio/wasmer/pull/514) [#519](https://github.com/wasmerio/wasmer/pull/519) Improved Emscripten network related calls, added a null check to `WasmPtr`
- [515](https://github.com/wasmerio/wasmer/pull/515) Improved Emscripten dyncalls
- [513](https://github.com/wasmerio/wasmer/pull/513) Fix emscripten lseek implementation.
- [510](https://github.com/wasmerio/wasmer/pull/510) Simplify construction of floating point constants in LLVM backend. Fix LLVM assertion failure due to definition of %ctx.

- [508](https://github.com/wasmerio/wasmer/pull/508) Update wapm version, includes bug fixes