fix typos
Merge pull request #1 from s0enke/patch-1

fix typos
Merged pull request #2
Added support for delayed metrics.
Bumped version to 0.2
Added README
Updated cli help messages to be more helpful
BugFix: Duplicate 'description' in setup.py
Updated usage text in README
Bumped version to 0.2.1
enable monitoring of ratios
refactored CloudWatchRatioMetric to use composition
small whitespace fix
make timespane editable
add summary for ratio metric