Merge pull request #530 from Aaronontheweb/dev

Akka.NET v0.7.1
F# code cleanup
revert old F# API Logging functions
Merge pull request #532 from vasily-kirichenko/fsharp-cleanup

F# code cleanup
Fixes #535 and #534

### Hocon values was not replaced when assigning a new value to the same path.

    a.b.c = 123
    a.b.c = 456

Result was 123456

### Hocon Arrays string representation was incorrectly indented.
Merge pull request #537 from rogeralsing/Hocon-value-overwrite-535-hocon-array-tostring-534

Hocon Value parse fixes #535 and Hocon ToString fix #534