Merge pull request #1 from slank/master

Fixup docs for module structure
added tag collection and snapshot class methods to ec2 interface
Merge pull request #2 from eredding-rmn/snapshots

added tag collection and snapshot class methods to ec2 interface
Merge pull request #3 from slank/master

Bump version number for changes from eredding.
added a dependency requirements file
Merge pull request #4 from jyu-rmn/master

added a dependency requirements file
added version
Merge pull request #5 from jyu-rmn/master

added version of the dependency
Don't pass empty lists to AuthorizeSecurityGroup*. fixes #7
Merge pull request #8 from slank/GH7

Don't pass empty lists to AuthorizeSecurityGroup*. fixes #7
Add python package build targets
Incompatibility with botocore 0.46+, fixes #9