Fix for segfault when generating integers

- Merge error left some code in where it shouldn't have been
Fix for Ruby-rand memory leak

- Also prefixes the "mt" member variable with a "m_"
Fix for segfault on missing default prng type

- The PRNG string wasn't being set to any default, and segfaulting
Merge branch 'moloch'

Conflicts:
	Untwister.cpp
	prngs/Ruby.cpp
Merged with upstream master