Configuration: Minor bugfixes for the Configuration class.
Configuration: Minor bugfixes for the Configuration class.

- Handle unexpected values better in constructor and load_file()
- Set size_invalid to FALSE in count()

M2Mobi/lunr,pprkut/lunr,M2Mobi/lunr,pprkut/lunr,M2Mobi/lunr,tardypad/lunr,tardypad/lunr,pprkut/lunr,tardypad/lunr