Compatibility with Python 3.4 and Python 2.7.6.

I had to fix some unit-test and add some encoding when reading files (because lxml can not create an XML document with encoding header from an unicode string).
Documentation update, with a small part for "contributing", and "compatibility".
Add a requirements.txt, because it's better for dev.
Bump setup.py and doc/conf.py version (0.2.x to 0.3.x).

Author: Exirel

.gitignore

@@ -37,3 +37,5 @@ htmlcov
 .mr.developer.cfg
 .project
 .pydevproject
+.settings
+

doc/conf.py

@@ -48,9 +48,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.2'
+version = '0.3'
 # The full version, including alpha/beta/rc tags.
-release = '0.2.0'
+release = '0.3.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.