1.0.6    12.01.2018
    - class panda::function - compareble version of std::function
    - class CallbackDispatcher - implementation of observer pattern
    - simple logger tools
1.0.5    08.09.2017
    - string::append now can use COW in case of empty string
1.0.4    07.05.2017
    - shared_ptr::operator bool is explicit now
1.0.3    16.05.2017
    - fix default pos value for find_last_of, find_last_not_of
1.0.2    16.05.2017
    - bugfix for stoX group of functions in case of no pos argument
1.0.1    15.05.2017
    - do not bootstrap so library (no XS code inside), it will be loaded automatically because of "-l" linker flag
1.0.0    11.05.2017
    - C++ code moved from Panda::Lib