Added 'dry run' to --noaction option 

Dry run is a well known cmd line option. -n does the same and having the 'dry run' phrase in the documentation would help in quicker understanding.
Merge pull request #33 from phalgun/master

Added 'dry run' to documentation for --noaction option
Tweak to --noaction documentation from phalgun
Merge branch 'master' of https://github.com/yalamber/ec2-consistent-snapshot into yalamber-master
remove trailing whitespace
Merge branch 'yalamber-master'
Add --tags option thanks to yalamber (fixes #27 on github)
credit where credit is due
credit where credit is due
Add more error checking and exit code. (fixes #37 on github)
Persist exit status errro through cleanup commands.
Persist exit status errror through cleanup commands.
Merge branch 'kill-query-on-timeout' of https://github.com/iFixit/ec2-consistent-snapshot into iFixit-kill-query-on-timeout
Merge branch 'iFixit-kill-query-on-timeout'
from https://github.com/alestic/ec2-consistent-snapshot/pull/39
Improve cleanup on database query timeouts and interrupts thanks to Daniel Beardsley. (fixes #23 on github)
Update README.md

Updated Installation Steps for Amazon Linux
Merge pull request #40 from dileep-p/master

Update README.md
Thanks to dileep-p for adding Amazon Linux install notes to docs.
Merge upstream (#5) into ifixit-production

Pull in all the changes from upstream

Error checking, correct exits status, and updates to the Readme.