Added som_retinotopy notebook to Tutorials and static HTML to _static
Updated featuremapper submodule and storage_fns
Udpated Tutorial page to use the notebook version of the SOM tutorial
Fixed bug concerning projection activities in Collector
Merge branch 'master' of github.com:ioam/topographica
Merge branch 'master' of github.com:ioam/topographica
Merge branch 'master' of github.com:ioam/topographica
Merge branch 'master' of github.com:ioam/topographica
Added link to github
Fixed docstrin
Fixed typo
Fixed formatting