Configuration.getInt() should define its accepted inputs, and should also accept octal

I can find no information about the format of the string that Configuration.getInt(String) accepts. I have determined by experimentation and examining the source that it accepts decimal integers, and hex integers if preceeded by "0x". This should be explained.

Also, it is customary for functions which accept decimal and hex to also accept octal. A string with leading "0" should be parsed as octal.

This should apply to getByte(), getShort(), and getLong() as well.