Changed relative file to absolute file

Using relative files causes a failure if you open a file within vim that is not in your current working directory. This can lead to unexpected results if there is an file name identical to the one you are editing in the working directory, and no markdown generated if there is no file with that name in the working directory.

Don't remove temporary files, and removed the time delay

Fixed background bug via longer delay and background process. Closes #2

Changed mapping to Ctrl-p instead of write until bux is fixed.

Added screenshot

Added on write to buffer trigger

Added background tab refreshing.
Supported for *nix.
Close #1

Initial commit