Added path in url.

Page#dir was returning the wrong dir ('/') for pages in directories.
first pass at --drafts flag
fix tests
add drafts.feature
fix whitespace in drafts.feature
Don't require date in draft filenames.
implement and use Draft.valid?
don't mess with dir parameter
fix draft filename processing
don't check if draft is published or if its date is in the future
whitespace fixes
Fix pretty url style paths.

Ignore the basename if the page is an index page, preserve it if it's just an
html page and use the full path in every other case.
Update Readme to link to the Plugins wiki page
Fixed plugin test error.
rename get_base() to containing_dir()
Fix broken post_url with posts with a time in their YAML front matter.
Add support for Ruby < 1.9
Fix invalid ordering of posts published on the same day and move post_url specific comparison of posts where it belongs: Into post_url
Fix jekyll-import LoadError message.
Merge branch 'drafts' of https://github.com/scribu/jekyll into scribu-drafts