v0.7.0 release

• Fixed a bug where the ignorecase was never used in view list
• Raise an error if the view doesnt exists while listing jobs
• Added capability to change the mode of a node
• Added support for giving node to restrict the job during creation
• Added support for notification_email option when setting up a job
• Added support for CVS provider in SCM
• Added create_dump_slave and delete methods in Node API
• Added BuildQueue class which is accessible by @client.queue method
• Improvements in all over the code for performance and error handling