Added pronouns to the data. These act similar to the other types of
words regarding getting random ones from the database.
More sentence types have been added, however they are all in their own
functions for now. Eventually, these functions will be replaced by
format strings in the database and will not be hard coded.
Removed the server object and moved the business layer into the main
namespace. This turns the main namespace into a library instead of a
server implementation. All of the http specific stuff (aside from
everything in frontend/) has been moved to the server commmand utility
in cmd/server.go.