Merge branch 'master' into f-of-t-nodes
Simulator queries IO to determine whether Node output needs to be transmitted.
Added ability to precompute output for Nodes which are a function of time.

- New APLX nengo_value_source to inject precomputed values into simulation
- New Vertex ValueSourceVertex to precompute Node values
- Config options `f_of_t` and `f_period` for periodic and aperiodic functions of time
# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch f-of-t-nodes
# Changes to be committed:
#	new file:   ../examples/fn_t_node.py
#	modified:   ../nengo_spinnaker/builder.py
#	modified:   ../nengo_spinnaker/config.py
#	new file:   ../nengo_spinnaker/nodes/value_source_vertex.py
#	modified:   ../nengo_spinnaker/simulator.py
#	modified:   Makefile
#	new file:   value_source/Makefile
#	new file:   value_source/slots.h
#	new file:   value_source/value_source.c
#	new file:   value_source/value_source.h
#
Merge branch 'master' into f-of-t-nodes

Conflicts:
	nengo_spinnaker/builder.py
	nengo_spinnaker/simulator.py
Merge branch 'master' into f-of-t-nodes
ValueSourceVertex correctly calculates number of dimensions and hence block size.
Correction to Node output.
Merge branch 'master' into f-of-t-nodes

Conflicts:
	nengo_spinnaker/simulator.py
Merge branch 'master' into f-of-t-nodes

Conflicts:
	nengo_spinnaker/config.py
Allow multidimensional functions to be marked as f-of-t Nodes.

Fix to syntax in nengo_spinnaker.Config.
Bugfix: Allow for 1 dimensional nodes in width calculation.
Merge branch 'master' into f-of-t-nodes

Conflicts:
	spinnaker_components/Makefile
Correct example.
Correctly interpret transform.
Merge branch 'transforms' into f-of-t-nodes

Conflicts:
	nengo_spinnaker/simulator.py
Changes as a result of merging in `transforms`.
Use the new Connections utility to correct f-of-t nodes.
Update fn_t_node.py

I know my `x` from my `y`.
`hstack` should be `vstack`.
Merge branch 'master' into f-of-t-nodes