Use the latest Steam library

https://github.com/RJacksonm1/node-dota2/issues/36

The old Steam library uses the new crc library that dropped support for Buffers.

This Steam version should probably be tested before it is used by default.
Merge pull request #37 from jimmydorry/patch-1

Use the latest Steam library
Merge pull request #5 from RJacksonm1/master

update fork