Implemented Curve keypair generation.
Implemented libzmq version helper class.
Spaceship operator tests for version.
Comparison operator tests for version.
Renamed Socket and Context "ptr" accessors to "pointer" and added #to_ptr
for consistency with LibZMQ.
Doc fix.
Doc.
Install and ZeroMQ readme doc.
Created readme code examples.
Created Proxy.proxy method.
Created proxy socket example doc.
Specified language of example code as Ruby.
Added tagline.