C++ Network Library Code

Changes:
- making basic_request<Tag> inherit from basic_message<Tag>
- implementing stub http::errors namespace
- re-implementing HTTP client to use lower level ASIO constructs instead of high level stream interface
- refactoring traits from Tags

Fixed incorrect string comparison in test cases. The code now uses std::mismatch to find the point of difference.
Fixed "fatal error" test report on linux on sending a signal to the python server to shut down. The code no longer waits for the shut down of the server, however, a method to kill the server process safely has to be found for both linux and windows to ensure complete automation of regression tests.

Fixed the header parsing code to remove extra '\r' before saving headers.
Fixed loss of newlines in the body due to missing '\n' after a getline call.

Minor Changes: Prevent a buffer overflow in strcmp calls. Fix the file_not_found test to ensure the presence of a body even in the case of an error response. Fix its associated comment.

Test suite that uses the python server to test the proper operation of http::client.

Jamfile.v2: updated to include the localhost_tests.cpp

localhost_tests.cpp: A set of 10 test suites that check the operation of http::client.

Added code for a lightweight python server that allows for testing the http::client code against a real world web server.
cgi_server.py : The main python script that sets up an http server at port 8000 on localhost.

cgi-bin/requestinfo.py : A CGI script that returns very few content headers and no content-length header.

test.xml : A sample text file. It is used to check correct processing of textual data and line endings.

boost.jpg : A jpeg image that is used to check the correct processing of binary data containing line endings.

Adding test for simple(r) HTTP Parser interface.

WARNING: This build breaks.

Branching off of http_integration to start working on task #149381:

Convert HTTPParser to templated boost::network::http::parser

Minor change: Added typenames before various parameters to make the library compile with VC8.

Breaking up parser traits into smaller pieces.