Pyhocon

* Support slash character / in keys (richard534) [166]

* Added resolve option to with_fallback (afanasev) [164]
* Allow unresolved substitution to use default string or substitution string (e.g., ${abc}) [163]
* Fixed tool (derkcrezee). [161]

* Fixed escaped quotes inside quoted and unquoted string (darthbear) [158]

* Fix non-root ConfigTree merge onto root ConfigTree (aalba6675) [156]
* Unresolved optional substitutions work with config merging (aalba6675) [153]

* Fixed self ref substitution (aalba6675) [142]
* Fixed with_fallback to not mutate config (aalba6675) [143]
* Fixed self reference (aalba6675) [146]
* Fixed complex substitutions (aalba6675) [148]
* Support attribute path a.b.c. (chunyang-wen) [150]
* Updated python version (hugovk) [151]

* Added compact option for hocon output. 129
* Unicode fix for unquoted strings. 130