Rename pelican.conf.py to pelicanconf.py to simplify invocation

This is the default that pelican looks for, so we can simply invoke
`pelican content` to build (`output` is assumed as well).

Signed-off-by: Alan Orth <alan.orth@gmail.com>
Merge pull request #58 from alanorth/settings

Rename pelican.conf.py -> pelicanconf.py to simplify invocation