README: Convert to structured text

This is a preferred format of Python READMEs and also properly rendered
by github.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

README.rst

@@ -1,11 +1,18 @@
 Setup tool for bitbake based projects
 =====================================
 
-|Branch  |Build Status|
-|--------|------------|
-|`master`|[![Build Status](https://travis-ci.org/siemens/kas.svg?branch=master)](https://travis-ci.org/siemens/kas)|
-|`next`  |[![Build Status](https://travis-ci.org/siemens/kas.svg?branch=next)](https://travis-ci.org/siemens/kas)|
++------------+------------------+
+|   Branch   |   Build Status   |
++============+==================+
+| ``master`` | |travis-master|_ |
++------------+------------------+
+| ``next``   | |travis-next|_   |
++------------+------------------+
 
+.. |travis-master| image:: https://travis-ci.org/siemens/kas.svg?branch=master
+.. _travis-master: https://travis-ci.org/siemens/kas/branches
+.. |travis-next| image:: https://travis-ci.org/siemens/kas.svg?branch=next
+.. _travis-next: https://travis-ci.org/siemens/kas/branches
 
 This tool provides an easy mechanism to setup bitbake based
 projects.
@@ -17,10 +24,10 @@ project configuration file and does the download and configuration
 phase.
 
 Key features provided by the build tool:
+
 - clone and checkout bitbake layers
 - create default bitbake settings (machine, arch, ...)
 - launch minimal build environment, reducing risk of host contamination
 - initiate bitbake build process
 
-
-[Documentation](https://kas.readthedocs.io)
+See the `kas documentation <https://kas.readthedocs.io>`_ for further details.

setup.py

@@ -32,7 +32,7 @@ __license__ = 'MIT'
 __copyright__ = 'Copyright (c) Siemens AG, 2017'
 
 HERE = path.abspath(path.dirname(__file__))
-with open(path.join(HERE, 'README.md')) as f:
+with open(path.join(HERE, 'README.rst')) as f:
     LONG_DESCRIPTION = f.read()