Arbor.js: text editor tab/space setup.
Measurements: use local computations rather than server-side,
and use Gaussian-smoothed arbors rather than 3-point averaged ones
for estimating the smooth cable length.
Add the lower-bound cable length for reference.
Measurements table is now a SkeletonSource.

The major motivation was to manage neuron names with neuronNameService.
Merge branch 'master' of github.com:acardona/CATMAID