Getting rid of boost

[tcies]

Here a list of what boost features we use and how we could get rid of them:

• shared_ptr: http://en.cppreference.com/w/cpp/memory
• random: http://en.cppreference.com/w/cpp/header/random
• graph: Implement ourselves
• filesystem: Implement ourselves (#ifdef OS_FLAG)
• date/time: http://en.cppreference.com/w/cpp/header/chrono
• program options: https://gflags.googlecode.com/git-history/master/doc/gflags.html
• accumulator: http://en.cppreference.com/w/cpp/algorithm/accumulate
• networking: http://zeromq.org/
• regex: http://en.cppreference.com/w/cpp/header/regex