Basic expanding (accordion) list implemented

The list item expands upon selection; only closes when another list item
is opened.
Also added tmp files to .gitignore
Changed animal_post parameters

Removed 'title' and 'body'.
Added 'name' (name datatype), 'description' (text), 'age' (date),
'vaccinated' (boolean), 'fertile' (boolean).
Changed Adopt Us table's animal name color
Added prototype table to Donate page
Added Header tag to the Donate page
Merge remote-tracking branch 'origin/AdoptableTable'