Feature/update neurons

[jefferis]

Still thinking about these additions from @alexanderbates

[jefferis]

Split away from #130

[jefferis]

@alexanderbates I would suggest combining these into a single function e.g. update_neuronlist. In general if a function does something closely related and returns the same kind of object then I would consider combining. In this case you have an argument to control which kind of update is required (with a default to update everything). Note also that read.neurons.catmaid actually fetches neuron names.

[jefferis]

@alexanderbates I would suggest combining these into a single function e.g. update_neuronlist. In general if a function does something closely related and returns the same kind of object then I would consider combining. In this case you have an argument to control which kind of update is required (with a default to update everything). Note also that read.neurons.catmaid actually fetches neuron names.

[alexanderbates]

Okay, done!