splango.models: refactor Experiment.variants. Created separated Variant class
splango.admin: added variant admin
splango.models: minor format fixes
splango.models: get or create a variant when declare(), generates no duplicated variants
splango.templatetags.splangotags: fixed comparison of variant name
Merge branch 'master' into dev-weighted-experiments
splango.models: fix Variant.name max_length
settings: added TEMPLATE_CONTEXT_PROCESSORS
added files to example project for testing purposes
splango: removed the human-confirmation code.

Based in https://github.com/c-oreills/Splango/commit/6e1c27c
Merge branch 'master' into dev-weighted-experiments

Conflicts:
	splango/models.py
splango.models.Variant: commented weight, not considering it at the moment.
splango.admin: commented unused `weight` attibute
splango.admin: format fixes
Merge branch 'no-human-confirmation' of github.com:lookup/Splango
Merge branch 'master' of github.com:lookup/Splango