Fixed param name in docstring get_all_policies()
Converted spaces to tabs in doc Makefile

The makefile was erroring out for me, so I changed 8 spaces to 2 tabs
Added cloudwatch alarm docs
Fixed docstring on MetricAlarm
Python 2.5.x fixes
Fix a flaky resumable upload test.
Spruced up all the certificate tests.
Another Py2.5 fix.
Altered connections to force the Host header.

This fixes signature errors on Python 2.5 when using SigV4.
Blacklist S3 from the forced host header as this breaks hmac-v1 signatures and bucket URL magic