Adding -first-item and -last-item. [magnars/dash.el#17]

`-first-item` is a trivial alias to `car`, so I used `defalias` so
there isn't the additional overhead of a function call. This has
broken `create_docs.sh`.

It seems that `defexamples` expects `symbol-function` to return an
elisp function definition, but `car` is implemented in C.
Add -rotate
Merge pull request #39 from Fuco1/rotate

Add -rotate
Release 1.7.0
Updating docs--signature to handle aliases and subrs

I've also removed docs--docstring since it's just 'documentation.
Merge pull request #36 from Wilfred/master

Adding -first-item and -last-item. [magnars/dash.el#17]
Release 1.8.0
Fix second example for -last/first-item
Fix incorrect alias checking in docs--signature

help-split-fundoc expects the function symbol to be the function
name used in the docstring. Since we only use help-split-fundoc for
subrs, this isn't an issue in practice, because subrs use
`(fn some-arg some-other-arg)` rather than an explicit name.

Still, the boolean ought to do what it says it's doing.
Merge pull request #41 from Wilfred/master

Fix incorrect alias checking in docs--signature