Assign the CloudWatch API endpoint URLs.

This fix is to avoid not to connect to the wrong URLs like
cloudwatch.ap-northeast-1.awsamazon.com but to connect to
the right URLs like monitoring.ap-northeast-1.awsamazon.com.
Merge branch 'develop' of git://github.com/miidumb/botocore into miidumb-develop
Use AWS_CONFIG_FILE for default environment variable pointing to new style config file.
Copy the EnvironmentVariables dict before updating it.  Make unit tests more self-contained.
Some unit tests around base.py.
Use region environment variable as a default value if no region is supplied to get_endpoint.  Also add a helper method in session to handle retrieving environment variables based on the logical name.  Fixes #8.
Update README.md

Added link to documentation.  Fixes #9.
Make sure the config is loaded when asked for available profiles.  See https://github.com/aws/aws-cli/issues/30.
WIP commit.
Ensure HTTP 200 response when querying instance meta-data for IAMs role
add a set_credentials method on the session class fixes #13
Fix a bug that some XML element values are parsed as empty string.

XML element that defined as a type of double is not correctly parsed.
This is because Element.set_value does not recognize the 'double' element type definition.

To reproduce this bug, execute "aws rds describe-reserved-db-instances-offerings" on aws-cli
and see 'FixedPrice' value is empty.
Merge pull request #16 from dai0304/feature/bugfix-double

Fix a bug that some XML element values are parsed as empty string.
Merge branch 'develop' of github.com:boto/botocore into develop
Lots of bug fixes related to parameter encoding. Updated to use new JSON service files.  Updated copyright notices.
Allow services with universal_endpoint attribute to use that endpoint as long as no explicit region is provided.
Merge branch 'no-config' of git://github.com/jbadigital/botocore into jbadigital-no-config
Add a token param to set_credentials method and update docstring.
Merge branch 'iam-creds-404' of git://github.com/jbadigital/botocore into jbadigital-iam-creds-404
Added ability to override the SSL cert verification.  Added default values for session variables.