update IJulia example to plot top-5 probability
update doc to reflect sys -> backend refactoring
refactor: use characterizations to replace layer type hierarchy
check network topology for back-propagation
unit-test for network topology check
tips about network topology
unit test net with circular dependency
increase reshape layer coverage
MemoryDataLayer can handle non-4D tensor
update to HDF5.jl 0.4.7
ConcatLayer for CPU (#14)
restruct concat layer dimension to be 1~3
ConcatLayer (#14) for GPU.
Document for ConcatLayer (#14)
Update travis CI for HDF5.jl 0.4.7
test HDF5-output force_overwrite
inner-product layer: takes multiple blobs
update inner-product layer doc
unit test: Argmax layer takes multiple blobs
update doc for Argmax Layer