Don't rewrite URLs

Remove the code that was appending ../static in front of some URLs, and add a
way to do cross-content linking.
update functional tests output

$ LC_ALL="C" pelican -o tests/output/custom/ -s samples/pelican.conf.py \
    samples/content/
$ LC_ALL="C" pelican -o tests/output/basic/ samples/content/
test that 4 occurences of log "skipping url replacement" are found
add support for relative cross-site links
update functional test output (relative cross-site links support)

$ LC_ALL="C" pelican -o tests/output/custom/ -s samples/pelican.conf.py \
    samples/content/
$ LC_ALL="C" pelican -o tests/output/basic/ samples/content/
add docs for cross-site linking
Merge pull request #460 from getpelican/remove-url-rewriting

Don't rewrite URLs
Updated documentation to reflect addition of new markdown types.
Add asciidoc reader support

http://www.methods.co.nz/asciidoc/index.html

Processes files ending in .asc with asciidoc. Extra arguments can be
passed by using the ASCIIDOC_OPTIONS config setting
Merge pull request #570 from bcl/master-asciidoc

Add asciidoc reader support
Merge pull request #611 from michaelreneer/master

Updated documentation
Strip tags from title in simple index. Fixes #612

This fix was applied previously to the relevant places in both the
"simple" and "notmyidea" themes, but the simple theme's index.html file
was apparently neglected.
add FILENAME_METADATA setting to extract metadata from filename

FILENAME_METADATA default to '(?P<date>\d{4}-\d{2}-\d{2}).*' which will allow
to extract date metadata from the filename.
update docs/settings.rst for both DEFAULT_METADATA and FILENAME_METADATA
test the "metadata from filename" feature
fix failing TestArticlesGenerator.test_generate_context test

new file have been added to the content directory so articles_expected needs to
be updated
add new file to functional test content to showcase FILENAME_METADATA

and update functional tests output
add more docs about FILENAME_METADATA
docfix: fix example of FILENAME_METADATA regexp
Merge pull request #606 from bbinet/metadata-from-filename

Extract metadata from filename