fixed reinsertion of energy, reverted to initial scene settings
added todo and helper ruby script
added sens constant factors for max samples
Merge branch 'master' into fast

Conflicts:
	src/sbf/RandomParameterFilter.cpp
added statement for multicore processing
refactored mi

so less memory needs to be allocated
merged master into fast
setting jouni now as define (0.002f was definitely to low)
added new random parameter: first reflection direction
fixed parameter settings
added define for reinserting of energy in hdr_clamp
added some very basic preprocessing

...that is bound to fail
only setting SampleData struct to zero when needed
declared some const functions/parameters
changed to bigger image that seems to yield better results
removed unused methods from SampleData
allowing now to crop box via define, disabled preprocessing
added defines for hdr clamp
changed scene to use lowdiscrepancy filter (and maxdepth set to 1)

just like jklethinen...
added rpf scene for teapot