Added legend parameter to tuning_curve

Tuning curve pylabplot option to omit legend if required.
Added __dir__ and __getattr__ methods to Simulation class

Extends behaviour to include simulation objects.
Allows IPython to tab complete for attribute
access eg. topo.sim.V1 instead of topo.sim['V1'].
Made GCAL be default tutorial, and fixed examples->models in tutorial
Updated Reference Manual to match split into multiple subprojects
Now points to github documentation for downloading, and fixed other outdated docs
Removed tag-release target; not valid for git
Updated for git, github and submodules, and fixed other outdated documentation
Updated for git, github and submodules, and fixed other outdated documentation
Updated for git, github and submodules, and fixed other outdated documentation
Updated for git, github and submodules, and fixed other outdated documentation
Put target=_top into hrefs consistently
Fixed typo
Announced update to web site
Added __dir__ and __getattr__ methods to EventProcessors

Extends behaviour to include the in_connections of event
processors.  Allows IPython to tab complete in_connections
with attribute access eg. topo.sim.V1.Afferent instead of
topo.sim.V1.projections('Afferent').
Merge branch 'master' of github.com:ioam/topographica
Updated reference to param submodule
coverage-related change to Makefile and runtests
Minor cleanups, fixes, and clarifications.
Added instructions for using pip and virtualenv
Fixed typo