Convert README to markdown and add Travis CI build status, closes #765

README.md

@@ -1,6 +1,8 @@
+# Subsurface [![Build Status](https://travis-ci.org/Subsurface-divelog/subsurface.svg?branch=master)](https://travis-ci.org/Subsurface-divelog/subsurface)
+
 This is the README file for Subsurface 4.7.2
 
-Please check the ReleaseNotes.txt for details about new features and
+Please check the `ReleaseNotes.txt` for details about new features and
 changes since Subsurface 4.6.4 (and earlier versions).
 
 Subsurface can be found at http://subsurface-divelog.org
@@ -12,7 +14,6 @@ https://github.com/Subsurface-divelog/subsurface/issues
 
 License: GPLv2
 
-
 We frequently make new test versions of Subsurface avilable at
 http://subsurface-divelog.org/downloads/test/
 These tend to contain the latest bug fixes and features, but also
@@ -22,7 +23,9 @@ that these are primarily intended for testing.
 You can get the sources to the latest development version from the git
 repository:
 
+```
 git clone https://github.com/Subsurface-divelog/subsurface.git
+```
 
 You can also fork the repository and browse the sources at the same site,
 simply using https://github.com/Subsurface-divelog/subsurface
@@ -31,16 +34,15 @@ If you want the latest release (instead of the bleeding edge
 development version) you can either get this via git or the release tar
 ball. After cloning run the following command:
 
+```
 git checkout v4.7.2  (or whatever the last release is)
+```
 
-or download a tar ball from:
-
-http://subsurface-divelog.org/downloads/Subsurface-4.7.2.tgz
+or download a tarball from http://subsurface-divelog.org/downloads/Subsurface-4.7.2.tgz
 
 Detailed build instructions can be found in the INSTALL file.
 
-System Requirements:
-====================
+## System Requirements
 
 On desktop, the integrated Googlemaps feature of Subsurface requires a GPU
 driver that has support for at least OpenGL 2.1. If your driver does not
@@ -52,19 +54,22 @@ the following:
 1) Learn how to set persistent environment variables on your OS
 2) Set the environment variable 'QT_QUICK_BACKEND' with the value of 'software'
 
-Basic Usage:
-============
+## Basic Usage
 
 Install and start from the desktop, or you can run it locally from the
 build directory:
 
 On Linux:
 
+```
 $ ./subsurface
+```
 
 On Mac:
 
+```
 $ open Subsurface.app
+```
 
 Native builds on Windows are not really supported (the official Windows
 installers are both cross-built on Linux).
@@ -87,9 +92,7 @@ this is also available as Documentation/user-manual.html. The
 documentation for the latest release is also available on-line
 http://subsurface-divelog.org/documentation/
 
-
-Contributing:
-=============
+## Contributing
 
 There is a mailing list for developers: subsurface@subsurface-divelog.org
 Go to http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface
@@ -136,9 +139,7 @@ independently of the longer explanation. Please use verbs in the
 imperative in the commit message, as in "Fix bug that...", "Add
 file/feature ...", or "Make Subsurface..."
 
-
-A bit of Subsurface history:
-============================
+## A bit of Subsurface history
 
 In fall of 2011, when a forced lull in kernel development gave him an
 opportunity to start on a new endeavor, Linus Torvalds decided to tackle