[keycloak-dev] Pushed docs for adapters clustering

[Marek Posolda]

I've pushed docs for adapters clustering and support for store account 
info in cookie https://issues.jboss.org/browse/KEYCLOAK-702, which seems 
to be last major thing for clustering support on adapters side required 
for release.

I am out tomorrow on public holidays, but back on Wednesday ready to 
help with whatever is needed for release (there is some probability to 
being stucked on portal again, but hopefully not...)

Marek