dynamodb v2 no indexes
change readme
removed incompatible boto versions for dynamo v2
use requires_boto_gte instead of removing the earlier versions
Merge branch 'master' into dynamov2_no_indexes
port changes from commit/8b278eb05d8c72ab11d48bc3bddf65b3b7b08279
add try catch for missing package in old boto versions
Merge pull request #69 from creyer/dynamov2_no_indexes

Dynamo v2 no indexes