List runtime dependencies in requirements.txt

More and more packages are listing their dependencies in
requirements.txt which make it trivial to maintain and install them.

MANIFEST.in

@@ -3,6 +3,7 @@ include LICENSE
 include CHANGES
 include AUTHORS
 include README
+include requirements.txt
 
 graft git/test/fixtures
 graft git/test/performance

README.md

@@ -14,16 +14,20 @@ The object database implementation is optimized for handling large quantities of
 * Mock by Michael Foord used for tests
     - Tested with 1.0.1
 
+The list of dependencies are listed in /requirements.txt. The installer takes care of installing them for you though.
+
 ### INSTALL
 
 If you have downloaded the source code:
 
     python setup.py install
-    
-or if you want to obtain a copy more easily: 
+
+or if you want to obtain a copy from the Pypi repository:
 
     pip install gitpython
-
+
+Both commands will install the required package dependencies.
+
 A distribution package can be obtained for manual installation at:
 
     http://pypi.python.org/pypi/GitPython

requirements.txt

@@ -0,0 +1,2 @@
+# Remember to update README.md
+gitdb>=0.5.1

setup.py

@@ -16,6 +16,8 @@
 VERSION = v.readline().strip()
 v.close()
 
+with open('requirements.txt') as reqs_file:
+    requirements = reqs_file.read().splitlines()
 
 class build_py(_build_py):
     def run(self):
@@ -73,7 +75,7 @@ def _stamp_version(filename):
       package_data = {'git.test' : ['fixtures/*']},
       package_dir = {'git':'git'},
       license = "BSD License",
-      install_requires='gitdb >= 0.5.1',
+      install_requires=requirements,
       zip_safe=False,
       long_description = """\
 GitPython is a python library used to interact with Git repositories""",