initial checkin for user agent filter.
get user agent working with media service.
enable UserAgent in Blob, ServiceBus, Queue and Table.
fix up of related classes.
code review feedback.
Merge pull request #14 from gcheng/useragent

Implementation of user agent.
Merge branch 'dev' of https://github.com/WindowsAzure/azure-sdk-for-java into dev

Conflicts:
	microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/serviceBus/implementation/ServiceBusRestProxy.java
resolve a merge conflict.
Merge pull request #240 from gcheng/dev

Dev