Added pip requirement files.

README

@@ -59,6 +59,21 @@ Linux prerequisites
 
 - PyQt 4.7.5 (http://www.riverbankcomputing.co.uk/news)
 
+The easy way!
+-------------
+
+There's an easy way to install the majority of the prerequisites above, and it's `pip <http://www.pip-installer.org/>`_ which has recently started to support Python 3. So install it and then run::
+
+    pip install -r requirements-[osx|win].txt
+
+([osx|win] depends, of course, on your platform. On other platforms, just use requirements.txt). 
+Because Sphinx doesn't support Python 3 yet, it's not in the requirements file and you'll have to 
+install it manually. You might have to compile PyObjC manually too (see gotchas below). Sparkle and 
+Advanced Installer, having nothing to do with Python, are also manual installs.
+
+PyQt isn't in the requirements file either (there's no package uploaded on PyPI) and you also have
+to install it manually.
+
 Prerequisite gotchas
 --------------------
 

requirements-osx.txt

@@ -0,0 +1,4 @@
+-r requirements.txt
+pyobjc-core>=2.3
+pluginbuilder>=1.0.0
+appscript>=1.0.0

requirements-win.txt

@@ -0,0 +1,2 @@
+-r requirements.txt
+cx_freeze>=4.2.3

requirements.txt

@@ -0,0 +1,5 @@
+jobprogress>=1.0.1
+Send2Trash3k>=1.2.0
+hsaudiotag3k>=1.1.1
+pytest>=2.0.0
+pytest-monkeyplus>=1.0.0