Listing previous entries in reverse order.

Fixes #8
Better matching for previous entries.

Now using a regexp match instead of an end_with? for much better control. It
helps to prevent weird crash/login loop when a markdown file with a weird name
is encountered in the app foler. This fixes #9.
Moved the write/login button.

I noticed that I tend to read and entry, then hit back key to write a
post. This is not ideal behavior, but it happens because there is no
write button on the navbar. So I moved the write button from the
homepage to the navbar.
Added markdown logos
Added the logout button back; Also removed big ugly mkd logo
Added local storage backups
Added cache control