Merge pull request #2 from bakhti/master

Unfortunately AWS regions and endpoints values don't always comply to strict rules

Thanks for the pull request
version 1.2
Added support for environment tiers
bumped version number to 1.3
preparing for a build
bumped version
add delete_environment command
waits for environment to terminate and adds dont-wait option
Merge pull request #4 from davecap/delenv

add delete_environment command
updated README.md
1.5