restructuralization
completely removed boost::any and boost::lexical_cast dependency
syntax tree is completely stand-alone
progress at individual
fixed bug when printing _ instead of )
added crossover and mutation functionality
fixed bug when random generator returned same result all the time
more comments
more comments
doxygen documentation
documentation
readme
added genetic functionality
global makefile
Merge branch 'dev'

Conflicts:
	main.cpp
	src/expr.hpp
	src/visitor_impl.hpp