Added GitHub markdown to image preview mapping

Merge pull request #11 from oshybystyi/support-for-github-flavoured-md

Added support for github flavoured markdown

Added support for github flavoured markdown

Made temp file and toggle global variables; updated README

Merge pull request #10 from gmerzu/master

Supports global variable to set a browser

Supports global variable to set a browser

Updated README to show defaults

Fixed remove temp file bug

Moved common variables up; interoperable browsers;
Fixed unix background bug

Updated README to show image support; Added new screenshot

Updated plugin mapping comments

Supports image loading and local html rendering

Include Safari on OSX

Merge pull request #5 from zeebo404/master

Changed relative file to absolute file

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