only require pandas if python isn't 2.6

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

setup.py

@@ -47,10 +47,13 @@ install = [
     'unicodecsv',
     'xlrd',
     'xlwt',
-    'pyyaml',
-    'pandas',
+    'pyyaml'
 ]
 
+# only require Pandas if Python isn't 2.6.
+if not (sys.version_info[0] == 2 and sys.version_info[1] == 6):
+    install.append('pandas')
+
 with open('tablib/core.py', 'r') as fd:
     version = re.search(r'^__version__\s*=\s*[\'"]([^\'"]*)[\'"]',
                         fd.read(), re.MULTILINE).group(1)