Merge pull request #177 from dcnieho/master

Fix version check error in Explode.m for Matlab 8.0 and later.
Added rod and melanopsin entries.  Still need to test.

Signed-off-by: David Brainard <brainard@psych.upenn.edu>
Merge branch 'master' of https://github.com/Psychtoolbox-3/Psychtoolbox-3
Added RodFundamentalTest, MelanopsinFundamentalTest.  Also T_melanopsin.   Got them all working nicely.

Signed-off-by: David Brainard <brainard@psych.upenn.edu>
Comment tweak.

Signed-off-by: David Brainard <brainard@psych.upenn.edu>
Merge branch 'upstream/master'
Staircase now using better interface consisting of struct of function handles when in v2 mode. When staircase is created with original call (no inputs), nothing has changed for the user. Internals are reworked though...
construct lookup table so that we evaluate psychometric function only once for each probe level