Format timestamp headers correctly
Lock to jshint 2.1.0
Merge pull request #141 from fhahn/master

Format timestamp headers correctly
Add example to create tags for new instances on EC2

Closes #140
Add debugging info for hostname and region in networking errors

References #145
Update IAM API
Update EMR API to use SigV4 and JSON
Update Redshift API for snapshot operations
Add support for SNS mobile push
Log error and exit if exception is raised from a callback

References #74
Bump version to v1.5.0
Let executor play nice with other libraries.

SequentialExecutor adds .async property to functions, but this
property is used by other libraries. Renamed this property to
`_isAsync` to avoid collision.

Closes #148
Partial revert of 8b35b22 (JSHint updates)

Fixes a regression that caused signature failures for special
characters in S3.

Closes #147
Add note about changing bucket name in getting started guide.

Closes #143
Update SWF client to use SigV4
Update EC2 API version to 2013-07-15
Add NPM version badge
Update API versions in README
Bump version to v1.5.1
Updated Amazon ElastiCache API version to 2013-06-15