Fix bug in documentation creation function.
HistoricalDiversities.jl is better named Ecology.jl since it includes new diversity measures.
Adding ability to define a community, an ecosystem of subcommunities, and similarities between the individual types within them.

We define:
- the Partition type to divide a Collection, and the Onecommunity and Subcommunity types within it.
- the Similarity type to define similarity between individuals, and the Unique or Species type, the GeneralSimilarity type, and the Taxonomy type within it.
- the Collection type of relative abundances associated with a Partition and a Similarity, and the specialisms of Ecosystem (many subcommunities) and Community (one community).
Updated documentation for github.io