Merge pull request #31 from hanchang/assembla

Included Assembla in hosting list, fixed 'more sites' link

views/tools.erb

@@ -117,6 +117,15 @@ local installations and with open source code.</dd>
 
   <h3>Public and Private Hosting</h3>
 
+<dl>
+  <dt id="assembla">Assembla</dt>
+  <dd><a href="http://www.assembla.com/">Assembla</a> offers secure and reliable 
+  Git hosting with features such as a web-based code browser, inline code commenting, 
+  support for git over http, easy-to-use merge request workflows, and deployment tools. 
+  Free private Git hosting provides unlimited users with 1GB. Public repositories 
+  are free and include bug/issue tracking and collaboration tools.</dd>
+</dl>
+
 <dl>
   <dt id="github">GitHub</dt>
   <dd><a href="http://github.com/">GitHub</a> is the largest hosting site