Adds Region field to Scalyr

[mccurdyc]

Proposed Change(s)

• Add Region field to all Scalyr CRUD operations.

Relevant (Referenced) Link(s)

• Fastly API Docs
• fastly/go-fastly

Validation

$ make test

git clone git@github.com:mccurdyc/cli.git /tmp/cli && \
(
    cd /tmp/cli && \
    git checkout mccurdyc/logging-scalyr-region && \
    make test && \
    rm -rf /tmp/cli \
)

[mccurdyc]

Force-pushed rebasing master.