Add a message and error out when Pygments returns nil.
Went with @stomar's suggestion
Add jekyll_figure plugin
Merge pull request #2158 from lmullen/patch-1
Update history to reflect merge of #2158 [ci skip]
Merge pull request #2148 from jekyll/error-when-pygments-errors
Update history to reflect merge of #2148 [ci skip]
Add travis_retry to config
Merge pull request #2160 from jpiasetz/travis
Update history to reflect merge of #2160 [ci skip]
Fix Post#url escape

Post#url was escaped using CGI.escape.
When file name contains a space character, its url points to
non-existing URL.

For example, when we have a post named '2014-01-02-foo bar.md',
we expect its url to be '/2014/01/02/foo%20bar.html',
but it was actually '/2014/01/02/foo+bar.html'.

We now define Jekyll::URL.escape_path and Jekyll::URL.unescape_path,
and use them to escape and unescape Post#url
Fix Page#url escape

Post#url wasn't escaped at all.

For example, when we have a page named 'a#b.html',
we expect its url to be 'a%23b.html',
but it was actually 'a#b.html'.

We now use Jekyll::URL.escape_path and Jekyll::URL.unescape_path.
Move URL escape to Jekyll::URL