first commit

CS4210/cs4210/proj2/TODO

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+TODO:
+
+o Check what the proxy should return when it can't get the host addr
+  or can't connect to host.
+
+o Figure out why read_line only reads one line and returns NULL for 
+  subsequent reads (perhaps this is only true for files?)
+
+Done:
+
++ Kill client socket after sending stuff.
+
++ Add the Host header field to requests from the proxy to the server.
+