Adding the delete and add modal dialog boxes for the layers page. There are still a few TODOs though, namely enabling the delete and add layer code and I wasn't sure what to do with the new data source and edit other settings buttons. Also the thumbnail view seems out of place here as we're creating a layer.
Merge branch 'layer-modal-dialogs' of https://github.com/RobertDenis/suite into RobertDenis-layer-modal-dialogs
Merge branch 'RobertDenis-layer-modal-dialogs'