added function to guess_scaling
modified stoch vol example to use it
added scaling inference
give NUTS a scaling default
give nuts default vars
add expensive memoization for theano functions
fixed discrete unif test
added test for memo
give random walk an sd param
give compilef memoize
added GHME example
add log normal
improved G
HME example
remove nonworking lognormal
fixed issues with GHME
remove figsize
fix problems with test tuning
fix guess scaling model param
update test
update test2