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
Merge pull request #1762 from micahhausler/documentation/fixes

Fixed documentation bugs. Fixes #1762.
Python 2.5.x fixes