Kill SimpleHTTPServer also on OS X
change default value for DEFAULT_DATE to None

(was 'fs' => guess from file mtime)
fix failing tests
restore test_basic_generation_works functional test
update "basic" output for functional tests so that test pass

LC_ALL="C" pelican -o tests/output/basic/ samples/content/
update contribute.rst doc

$USER environment variable is no longer needed
Merge branch 'restore-basic-functional-test'
update changelog to reflect changes from #592
Fix missing SITEURL and base home link

1. Following up on bbinet's changes in f12a297, ensure that the notmyidea
theme's article.html template includes the SITEURL variable when
constructing URL links.

2. Add missing slash to the base.html template so that clicking on the
site header at top left refers to "/" instead of "" when SITEURL is not
defined. Otherwise, the "" target will cause the browser to load the
current page and not the site's root (as one would expect).
Fixed line ending problems by adding a .gitattributes file
Reimplemented the gzip compression as a plugin.

Extending the Writer wasn't the complete answer because the static
generator also copies some files. Instead, I implemented the work as a
plugin that attaches to the finalized event.
Added some documentation about the gzip plugin.
Added some unit tests for the gzip cache plugin
Merge branch 'pr/586' (closes #586)
update changelog: add gzip_cache plugin
pages should be in the content folder
Change the way to compute relative paths to avoid the leading `.././` when using
relative urls.
Update the basic and custom tests output.
Merge pull request #605 from saimn/relative_links

Change the way to compute relative paths to avoid the leading `.././` when using  relative urls.
Merge pull request #588 from tpievila/dev_server_fix

Kill SimpleHTTPServer also on OS X