Support filenames/paths with blanks

[jghauser]

[AmalIrfan]

I am not sure but I think in `common md` syntax this

[Link To A File](<Path To The File.md>)

works in some places but is unsupported in others. Right now I use this (amazing) plugin by compromising and naming all files with underscores separating words instead of spaces.

[Link To A File](Path_To_The_File.md)

not a big deal, though the former is prettier.

[tvanyo]

I would love to have this issue resolved. If I knew where to do it in the code I would make the change.

[jghauser]

Implemented by #19