Make trailing slashes for metadata URLs explicit and remove the trailing slash from userdata calls. This is an alternative implementation to #1897.
Removing `dimensions` from Metric.query() docstring (not applicable to function signature)
Fix example for building metadata URL
Merge pull request #1900 from danielgtaylor/metadata

Make trailing slashes for EC2 metadata URLs explicit & remove them from userdata requests. Fixes #1900, #1897, #1856.
Merge pull request #1901 from oxtopus/cloudwatch-metrics-docstring-fix

Removing `dimensions` from Metric.query() docstring. Fixes #1901.
Updated DDBv2 for Global Secondary Indexes.
Implement nonzero for Item to consider empty items falsey

Fixes #1899.