Use C++11

[fungos]

We need to use the most of C++11 that Clang/GCC/VS2010 supports, being Clang the most important compiler.

[fungos]

http://www2.research.att.com/~bs/C++0xFAQ.html#when-compilers

Features we should use:

• rvalues
• initialization lists
• static assertions
• auto types
• extern templates
• nullptr
• delegated constructors
• unicode
• defaulted and deleted functions
• range-based for
• explicit virtual overrides
• atomic operations
• std::thread