update to better markdown plugin
Merge pull request #17 from binaryphile/vim-markdown

update to better markdown plugin
docs: switch to new vim-markdown plugin
docs: update star counts for readme plugins
fix: use $HOME instead of ~
fix: escape filename before sourcing
feat: add support for custom plugins

closes #15
docs: update star counts for readme plugins
chore: sort by stars then name in plugins list
Merge remote-tracking branch 'upstream/master'

Conflicts:
	.gitignore
	README.md