also:
- fixed value comparison with special floats
- added all the remaining conformance tests from BurntSushi/toml-test and iarna/toml-spec-tests
- added toml::inserter
- added license boilerplate to test files
also:
- significantly improved the performance of toml::parse_file
- improved the performance of printing to streams for deepy-nested TOML data
- simplified some of the examples
- added more tests
- cleaned up some of the test code
also:
- added note about `#include <fstream>` requirements README
- added tests for parse_result
- added array and table iterators to the toml namespace