Set Safari as default browser for OSX

Move OS detection to the top of the script

Add preview browser name to OSX open call

Merge pull request #24 from rpoddighe/master

Correctly handle spaces in local filepaths

Correctly handle spaces in local filepaths

Added xdg-open support

Check if global flags exist before setting them

Handle space in filepath names; Fixes #19

Added variable to remap ctrl-p

Fixed image rendering markdown path

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

Fixed remove temp file bug

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

Updated plugin mapping comments

Supports image loading and local html rendering