Remove execute permission from files not intended to be entry points

diff --git a/tornado/httputil.py b/tornado/httputil.py
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/tornado/test/ioloop_test.py b/tornado/test/ioloop_test.py
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/tornado/test/stack_context_test.py b/tornado/test/stack_context_test.py
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/website/static/facebook.png b/website/static/facebook.png
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/website/static/friendfeed.png b/website/static/friendfeed.png
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/website/static/twitter.png b/website/static/twitter.png
old mode 100755 (executable)
new mode 100644 (file)