* Reverted std::bind to boost::bind. std::bind on Visual 2012 doesn't work in some cases (especially with std::ref), not sure why [but it seems to be a bug, since 2013 preview compiles the same code fine].
* Move assignment operator for VS 2012.
- BOOST_FOREACH -> for
- replaced several boost classes with std (e.g. unordered)
- removed gcc-4.5 workarounds
- ran clang c++11 migration tool to detect some cases:
- - pointer initialized with "0" to nullptr
- - replace for with iterators with range-based for
- - use auto in some situations (type name specified twice, avoid long iterators type names)
- use std versions of function, bind and ref
- OVERRIDE -> override
- NULL -> nullptr
- use std versions of random distributions
NOTE: this may be last revision that supports gcc-4.5
