Adding HTML5 snippets for tags starting with `<`

+ Its super annoying when you type `<tag` and then hit tab… only to be left with `<<tag></tag>`!
Update DocBlockr SCSS completions
Misc package updates
Open all HTML as HTML5
Open-Include package should know to look for underscore files

+ Will automatically open `folder/folder/_partial.scss` when triggered from `@import folder/folder/partial;`
Package Control Update