Added group_variable_set template because reset is hardcoded to
_spikespace now, fixed reset to not use _spikes
Fixed SpikeMonitor to use _spikespace
Fixed RateMonitor to use _spikespace
Removed all reference to _spikes Variable
Only include the standard units, not the additional units in the unit namespace. Closes #103
Remove a TODO comment that no longer applies
Merge pull request #102 from brian-team/no_more_spikes

No more _spikes attribute (replaced by _spikespace which was introduced with #97)
Nicer LaTeX printing for equations (no partial derivatives)
Allow references to pre/post variables in expressions used to set synaptic state variables.
Allow references to pre/post variables in expressions used to index synaptic state variables.
Allow references to pre/post variables in synaptic model equations
Fix use of pre/post variables with subgroups
Allow references to pre/post variables when creating synapses
Fix the template for a combination of connection mask and probability
Add an example showing the use of string expressions for spatial connectivity
Re-add the unit checking for string assignments that was accidentally removed at some point
Implement a new "int_" function, to convert booleans into integers. This should be used whenever a boolean variable is used in a multiplication, e.g. in the "unless-refractory" variables which multiply the RHS of an equation with "not_refractory". Closes #38
Merge branch 'master' into fix_pre_post_references
Merge pull request #108 from brian-team/fix_pre_post_references

Allow pre/post references in synaptic expressions
make sure that test modules are not included in test coverage