Added very basic toolbar for Markdown editor.
Made breadcrumbs an optional component of the page.
Removed popup parameter since users must have JavaScript enabled anyway. Implemented closing of popup window as well.
Implemented image uploading in the Markdown editor.
Implemented warning when user navigates away from editor with unsaved changes (closes #30).
Added permanent redirect for old blog URLs.
Added user first name and last name to profile form (closes #38).