closes#280
- adds image uploader to user profile page.
- click on cover picture or change cover button to open file upload modal.
- created new upload modal that extends model to reduce some code duplication
issue #432
adds a modal template for image uploads
adds buttons to settings page to upload images for blog logo and icon
once image is uploaded displays an 'X' to reset back to dropzone
saves image and renders settings page.
ToDo
add url field when clicking on url icon
fix position of 'X' for both settings and editor
closes#452
- changed keyboard shortcut to insert ![].. not !image[]
- changed regex in ghostdown to only work for ![]
- added a further regex in ghostdown to properly match for URLs inside the parens
