issue2573 Bugfix for boto.dynamodb2.table.Table#query_count where a Count query would be erroneous
issue2573 Fixing line length based on PR feedback
Parse ClusterStatus’es StateChangeReason.
Improve handling of HTTP 204 responses.

HTTP 204 responses have no body, but can have any headers they like,
including, counter-intuitively, ones specifying the content type.

This makes sure Boto won't pass a 0 length body to the json parser in
response to a 204 status from Glacier.

Unit test added to catch any regression.
correct argument type in doc string
fix raising exception syntax in python 3
Fix EMR endpoint
iam: add support for Account Password Policy APIs

This commits adds support to iam module for all currently available APIs
related to Account Password Policy, introducing three new public methods:
 * get_account_password_policy()
 * delete_account_password_policy()
 * update_account_password_policy()

IAM Password Policy and API reference:
http://docs.aws.amazon.com/IAM/latest/UserGuide/Using_ManagingPasswordPolicies.html

Signed-off-by: Luca Bruno <luca.bruno@rocket-internet.de>
tests: add tests for IAM Account Password Policy APIs

This commit adds one unit and one integration test for the IAM
Account Password Policy methods.

Signed-off-by: Luca Bruno <luca.bruno@rocket-internet.de>
tests: properly tag IAM integration tests

Signed-off-by: Luca Bruno <luca.bruno@rocket-internet.de>
minor documentation fixes
fix pep8
Merge pull request #2574 from lucab/lucab/to-upstream/iam-password-policy

iam: add support for Account Password Policy APIs
Updated link to current config documentation
Add cloudsearchdomain
Sign request headers for uploads and search
Merge pull request #2717 from andersenyang/cloudsearchAuth

Fix CloudSearch2 to work with IAM-based search and upload requests
Throw host warning for cloudsearch domain
Merge pull request #2765 from kyleknap/cloudsearchdomain-warning

Throw host warning for cloudsearch domain
Fix the SQS certificate error for region cn-north-1

Fix this error:
InvalidCertificateException: Host sqs.cn-north-1.amazonaws.com.cn returned an invalid certificate