Expose original spark stream as _spark.
Upgrade to primus 2.0.0 /cc @Dignifiedquire
Merge branch 'expose' of https://github.com/Dignifiedquire/share-primus
MIT
Only depend on Primus. Misc build and doc improvements.
0.0.2
Don't patch twice (npm install and README instruction)

In fact, don't patch at all - the sharejs bug we patched is
fixed in the latest alpha release.

Closes #5
0.0.3