Update Client.cs

Added hexists, zincr, zexists, zrange, zrrange commands
Update Client.cs
Added hexists, zincr, zexists, zrange, zrrange
Added hexists, zincr, zexists, zrange, zrrange commands to the c# client

Added hexists, zincr, zexists, zrange, zrrange commands to the c# client
Added hexists, zincr, zexists, zrange, zrrange commands to the c# client
update README
Merge pull request #120 from Ceyword/master

Added hexists, zincr, zexists, zrange, zrrange commands to the c# client
Merge pull request #124 from ideawu/master

Master