Fixups
Move current abstracts to Markdown page

Try to delegate formatting to later. I'm not really happy with this
solution, but it'll do.

This also adds a new abstract-specific stylesheet to the single layout,
which might not be perfect (or yes, since we'll move those abstracts to
the main page anyway probably).
Switch to kramdown engine

The output looks the same.

I compared the generated output, and the differences are minor and for
the better (essentially, extra ids for titles).

Here is the diff:

$ diff -uwr _site_redcarpet/ _site_kramdown/
diff -uwr _site_redcarpet/abstracts.html _site_kramdown/abstracts.html
--- _site_redcarpet/abstracts.html	2014-09-03 20:17:31.000000000 +0200
+++ _site_kramdown/abstracts.html	2014-09-03 20:17:06.000000000 +0200
@@ -52,7 +52,7 @@
 field.
 </div>

-<hr>
+<hr />

 <p><span class="author">
 Yufei Cai
diff -uwr _site_redcarpet/index.html _site_kramdown/index.html
--- _site_redcarpet/index.html	2014-09-03 20:17:31.000000000 +0200
+++ _site_kramdown/index.html	2014-09-03 20:17:06.000000000 +0200
@@ -26,8 +26,7 @@
     <!-- MAIN CONTENT -->
     <div id="main_content_wrap" class="outer">
       <section id="main_content" class="inner">
-	<h3>Call for participation</h3>
-
+	<h3 id="call-for-participation">Call for participation</h3>
 <p>We warmly invite all programming-language researchers in Hesse to the Second
 Hessian Workshop on Programming Languages in Marburg on September 11, 2014.</p>

@@ -59,14 +58,12 @@
 <p>We will add further details to this page in due time.
 Should you have any questions, please do not hesitate to contact any of the organizers.</p>

-<h3>Previous Workshops</h3>
-
+<h3 id="previous-workshops">Previous Workshops</h3>
 <ul>
 <li><a href="http://erdweg.org/HessPL/index.html">First Hessian Workshop on Programming Languages</a> (June 28, 2013, TU Darmstadt)</li>
 </ul>

-<h3>Organizers</h3>
-
+<h3 id="organizers">Organizers</h3>
 <ul>
 <li><a href="pgiarrusso@informatik.uni-marburg.de">Paolo Giarrusso</a> (University of Marburg)</li>
 <li><a href="rendel@informatik.uni-marburg.de">Tillmann Rendel</a> (University of Marburg)</li>
Reformat abstracts using Kramdown syntax

Benefits:
- we don't have to use HTML syntax, which breaks abstraction and is heavier
- Markdown syntax is still recognized (while it wasn't inside HTML blocks)

Also add a template for other abstracts.
Add other couple of submitted talks
Remove text list of abstracts