C++ Network Library Code

Updated documentation.

Fixes for building on GCC 4.2.3 in Ubuntu.

Changes
- Using correct string traits to get the correct type for the string to use based on the tag.
- Using safe(r) string processing methods for handling header lines from the HTTP response.
- basic_response<> now contains version(), status(), and status_message().

TODO:
- multi-line headers processing
- multi-part message posting
- change from multi-map to vector to preserve request header ordering?

Using Boost.Range for iterator ranges instead of a plain pair of integers.

Initial documentation import.

Creating branch for documentation changes.

Adding simple HTTP client example and Jamfile.

Further refactoring of HTTP client that now exposes three new API calls: PUT, DELETE, and POST.

Refactoring HTTP Client internals and added 'head' support.

Test commit. Just a bit of cleanup.