Add support for namespace at point.

Useful in snippets or for adding after license.
Make clojure-find-ns handle ns declarations with leading whitespace

- extend `clojure-namespace-name-regex` to allow zero or more
  whitespace characters before the ns form
Merge pull request #170 from phillord/ns-at-point

Add support for namespace at point.
Merge pull request #171 from ragnard/handle-space-before-namespace

Make clojure-find-ns handle ns declarations with leading whitespace
Correctly fill the docstring

First, use the fill-column setting of the edited file and not the global
one.

Second, fill the first line correctly. Previously the first line of
docstring could be filled to fill-column+1 characters, because the
initial " was dropped out of the fill calculations.
Merge pull request #172 from miikka/fill-docstring

Correctly fill the docstrings