Use markdown in README and display travis-ci build status for master branch.

Signed-off-by: Mariusz Fik <fisiu@opensuse.org>

README.md

@@ -1,8 +1,9 @@
 qBittorrent - A BitTorrent client in Qt4
 ------------------------------------------
 
-Description:
+[![Build Status](https://travis-ci.org/qbittorrent/qBittorrent.png?branch=master)](https://travis-ci.org/qbittorrent/qBittorrent)
 ********************************
+###Description:
 qBittorrent is a bittorrent client programmed in C++ / Qt4 that uses
 libtorrent (sometimes called rblibtorrent) by Arvid Norberg.
 
@@ -13,13 +14,14 @@ support as well as many features.
 This product includes GeoLite data created by MaxMind, available from
 http://maxmind.com/
 
-Installation:
-********************************
+### Installation:
 For installation, follow the instructions from INSTALL file, but simple:
 
+```
 ./configure
 make && make install
 qbittorrent
+```
 
 will install and execute qBittorrent hopefully without any problem.
 
@@ -33,7 +35,7 @@ Please report any bug (or feature request) to:
 http://bugs.qbittorrent.org
 
 You can also meet me (chris-qBT) on IRC:
-#qbittorrent on irc.freenode.net
+`#qbittorrent on irc.freenode.net`
 
 ------------------------------------------
 Christophe Dumez <chris@qbittorrent.org>