added test cases fib.lua and parseCSV.lua
Revert "Clean up obfuscator before integration"

This reverts commit f0b4193e23b96ed5c0bc213361435d3ae1415f5b.
Revert "Pull PKU obfuscator updates"

This reverts commit be786ac89bb5aba9b8d5e56e6604cc86644d1e11.
Added PKU obfuscators
Add PKU ExchangeOfLetters algorithm and README