Prevent implicit string decode in hmac-v4 handlers. Fix #2033
read EvaluateTargetHealth from resource record set
add tests for reading alias DNS record
initial interface for a request hook, sample interface and example for logging
added filename to constructor
Merge pull request #2037 from dangra/2033-bugfix

Prevent implicit string decode in hmac-v4 handlers. Fixes #2037, #2033.
Merge pull request #2120 from zihaoyu/develop

Read EvaluateTargetHealth from Route53 resource record set. Fixes #2120.
Allows use of throughput kwargs with GlobalIncludeIndex - fixes #2055.
DDB queries with GSI now work with a single filter.
Don't pull the security token from the environment or config
when a caller supplies the access key and secret
Merge pull request #2123 from jimbrowne/security-token-env-ignore

Don't pull the security token from the environment or config when a caller supplies the access key and secret. Fixes #2123.
Fixed typo.
Merge pull request #2125 from dkavanagh/request-hooks

Add request hooks and request logger. Fixes #2125.
Merge branch 'ddb-gsi-fix' into develop

Fixes #2122.