Adding support for kinesis application metrics

[gneokleo]

• Adding another template support for pulling metrics for kinesis applications. Kinesis applications cannot be "discovered" so they can't be parameterized and they have to be known in advance. In other words, the namespace field has to be filled out. The template however can discover all the shards and streams that are available.
• Make jinja load its file system based on where the config file is. It's not necessarily true that the config file will live under the same directory as plumbum

[crccheck]

Thanks! leaving this open for now otherwise I'll forget to push a release to PyPI