exceptions: Make Tlv::Error a base class for all packet-processing exceptions

This commit also includes a number of code style fixes.

Change-Id: I44f83915e733b43d5f43b4266902c8262e928d91
Refs: #1528
diff --git a/src/transport/tcp-transport.hpp b/src/transport/tcp-transport.hpp
index 6795580..db90ae4 100644
--- a/src/transport/tcp-transport.hpp
+++ b/src/transport/tcp-transport.hpp
@@ -26,11 +26,11 @@
   ~TcpTransport();
 
   // from Transport
-  virtual void 
+  virtual void
   connect(boost::asio::io_service& ioService,
           const ReceiveCallback& receiveCallback);
-  
-  virtual void 
+
+  virtual void
   close();
 
   virtual void
@@ -39,10 +39,10 @@
   virtual void
   resume();
 
-  virtual void 
+  virtual void
   send(const Block& wire);
 
-  virtual void 
+  virtual void
   send(const Block& header, const Block& payload);
 
 private: