3.1.0

Add | sidebar for headings Cmd/Ctrl + 2
Add | recent folder Cmd/Ctrl+Shift+E

Improve | popups to be scrollable
Improve | overall UI
Improve | Sidebar watches all visible directories and updates them
Improve | untitled document now shows the current project
Improve | update Electron to 1.7.4

Fix | Wrong Cursor Position After Soft Hyphen #414
Fix | Scrollbar rendering incorrectly (doubled) Win10/Caret 3.0.2 #416
Fix | creating a folder from "Go To File" doesn't work
Fix | "Save As" doesn't change the project folder
Fix | retrieving undo/redo history after app restart fails
Fix | resizing the window and then immediately closing it throws an error
Fix | overlay breaks after Purchase Prompt is shown