Declare official python3 support

.travis.yml

@@ -4,6 +4,9 @@ sudo: false
 python:
   - "2.7"
   - "3.3"
+  - "3.4"
+  - "3.5"
+  - "nightly"
 
 install:
   - pip install .  # See setup.py

README.md

@@ -37,7 +37,7 @@ Please see [User Guide](http://docs.tracer-package.com/en/latest/user-guide/)
 
 ## Requirements
 - Supported linux distribution - There are currently supported [Fedora](http://fedoraproject.org/), [Gentoo](http://www.gentoo.org/), [Debian](https://www.debian.org/), and [Arch](https://archlinux.org)
-- Python interpreter
+- Python interpreter (tracer is compatible with both 2.7 and 3.x)
 - Python [psutil](https://code.google.com/p/psutil/) module. Available [here](https://admin.fedoraproject.org/pkgdb/acls/name/python-psutil) and [here](https://packages.gentoo.org/package/dev-python/psutil).
 - Python [beautifulsoup](http://www.crummy.com/software/BeautifulSoup/bs4/doc/) module. Available [here](https://admin.fedoraproject.org/pkgdb/acls/name/python-beautifulsoup4) and [here](https://packages.gentoo.org/package/dev-python/beautifulsoup)
 

doc/source/developer-guide.rst

@@ -4,7 +4,7 @@ Developer Guide
 Python
 ------
 
-Tracer is build on Python 2.7 because this version is most spread on linux systems. Besides basic python, tracer requires its few packages:
+Tracer is written in Python and it is compatible with its both 2.7 and 3.x versions. Besides standard python interpreter, tracer requires its few packages:
 
 - `psutil`_ - For getting informations about processes, memory, etc
 - `beautifulsoup`_ - For parsing user defined xml files such as ``data/applications.xml`` and ``data/rules.xml``

tracer.spec

@@ -13,18 +13,31 @@ URL:		http://tracer-package.com/
 # tito build --tgz
 Source0:	%{name}-%{version}.tar.gz
 
-BuildRequires:	python2-devel
 BuildRequires:	asciidoc
+BuildRequires:	gettext
+%if 0%{?with_python3}
+BuildRequires:	python3-devel
+BuildRequires:	python3-sphinx
+BuildRequires:	python3-beautifulsoup4
+BuildRequires:	python3-psutil
+BuildRequires:	python3-pygments
+BuildRequires:	python3-lxml
+Requires:	rpm-python3
+Requires:	python3
+Requires:	python3-beautifulsoup4
+Requires:	python3-psutil
+%else
+BuildRequires:	python2-devel
 BuildRequires:	python-sphinx
 BuildRequires:	python-beautifulsoup4
 BuildRequires:	python-psutil
 BuildRequires:	python-pygments
 BuildRequires:	python-lxml
-BuildRequires:	gettext
 Requires:	rpm-python
 Requires:	python
 Requires:	python-beautifulsoup4
 Requires:	python-psutil
+%endif
 
 %description
 Tracer determines which applications use outdated files and prints them. For