Update Web IDE modal when leaving page after making a change (include saving unsaved changes)
When you make a change in the Web IDE and then try to navigate away, you see the following modal: ![Screen_Shot_2018-08-27_at_8.17.47_AM](/uploads/59dc2f9af4b0cb973c0b09ce2b600206/Screen_Shot_2018-08-27_at_8.17.47_AM.png) We can improve this by using a gitlab modal and giving the user options for how to continue: cancel, commit, or abandon changes ![web-ide--modal](/uploads/e52060999c9480dea222a53ad9435337/web-ide--modal.png)
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