Merge pull request #16 from nicholas-leonard/master

SoftMaxTree + TreeNLLCriterion
initial commit for Push/PullTable
PushTable/PullTable:forward works (unit tested)
initial commit for PushTable/PullTable:backward
PushTable/PullTable unit tested
PushTable/PullTable documented
fixed SoftMaxTree unit test bug (missing zeroGradParameters)
Push/PullTable : unit tested multi-pull case
Merge pull request #18 from nicholas-leonard/pushpull

PushTable (and PullTable)
Update README.md
SpatialReSampling:updateOutput works with batches
SpatialReSampling:updateGradInput works with batches
SpatialReSampling documentation
fixed doc bug
Merge pull request #19 from nicholas-leonard/resampling

SpatialReSampling++
fixed doc
SpatialReSampling rwidth/rheight batch fixes
merge