Added some HTML snippets

Doctype, CSS links, and JS scripts for now

Will probably add in LESS links and possibly a basic document skeleton (this
probably could be done with a template engine instead)
Added some pentadactyl support

Trying to configure my pentadactyl (kind of like it, but it does have some issues)
so added some ftplugin settings and a syntax file
Made the trim on write controllable

Mostly for the pentadactyl file but other filetypes may need to disable the trim
whitespace on write.
Small change for the header ex def in python
Ignore netwrhist file
Use the new flag for markdown rather than remove