Anton Gladkov

Add expire along with hmset

4

#101 related ticket

Update 'configuration' section

2

Add plugin requirement

Different behavior on group's link/link_error usage

13

## Steps to reproduce ``` g = group(sig1, sig2) g.link(sig3) # links to sig1 g.link_error(sig4) # links to sig1 g.apply_async(link=sig3) # raises TypeError g.apply_async(link_error=sig4) # raises TypeError ``` ## Expected...