The functions associative->dom and sequential->dom now uses a
hash-key (md5) as :key (react key) instead of the corresponding data
structure itself. This change prevents that the data-reactid attribute
values in the DOM get very long, since before every child repeats the
full data of the parent in its data-reactid attribute value.
Added a first version of a pagination feature that enables ankha to
stay responsive in cases where the observed value contains sequential
data with hundreds or thousands of items. The 'edit on double click'
functionality has been removed, since it interferes with clicking on
the pagination buttons (if done very fast).

TODO: The page-item-count is not configurable yet.
Merge pull request #16 from maxweber/pagination

Pagination for large sequential collections