Update README and setup.py.

Author: danhper

README.md

@@ -5,15 +5,13 @@ This library provides i18n functionality for Python 3 out of the box. The usage
 
 ## Installation
 
-Simply download the package and run
+Just run
 
-    python setup.py install
+    pip install python-i18n
 
-Make sure you are using Python 3. If you want to use YAML translation files, you will need PyYAML installed as well. If you are using `easy_install`, you can use
+If you want to use YAML to store your translations, use
 
-    easy_install python-i18n[yaml]
-
-to install both.
+    pip install python-i18n[YAML]
 
 ## Usage
 ### Basic usage

setup.py

@@ -14,12 +14,16 @@
     include_package_data=True,
     zip_safe=True,
     test_suite='i18n.tests',
+    extras_require={
+        'YAML': ["pyyaml>=3.10"],
+    },
     classifiers=[
         'Development Status :: 4 - Beta',
         'Environment :: Other Environment',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
+        'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 3',
         'Topic :: Software Development :: Libraries'
     ],