Merge branch 'unstable' as v0.5-RC3

Pull in latest changes from unstable branch:
- add support for index scan direction to query and queryOnce methods
- update to AWS SDK 1.6.0 (small internal changes to S3 wrapper)
- add support for limiting the size of the result set for query
- improve the overloading of query
Merge branch 'unstable' as v0.5-RC4

Pull in latest changes from unstable branch:
- introduce an integration test suite using DynamoDB Local (#11)
- update to AWS SDK 1.7.1 (and other deps)
- fix race condition in S3 FutureTransfer.listenFor (#13)
Merge branch 'unstable' as v0.5-RC5

Pull in latest changes from unstable branch:
- update to Scala 2.10.3
- fix deadlock in S3 FutureTransfer.listenFor (#14)
Merge branch 'unstable' as v0.6.0

Pull in latest changes from unstable branch:
- Pull request #19
update README for version number
improve scaladoc generation

- turn on source linking in scaladoc and link to git tree on GitHub via tags, using the -sourcepath and -doc-source-url flags
- build an api mapping for http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/
- fix javadoc links using http://stackoverflow.com/a/25070934
Merge pull request #20 from pellucidanalytics/topic/scaladoc

improve scaladoc generation