force autocommand processing for the BufReadPost group when the
vim.current.buffer is set in the python code, forcing modeline
processing
force a doautocmd call when creating a new note from the current buffer
Merge pull request #58 from insanum/modeline

force autocommand processing for the BufReadPost group when the buffer is set by python

I.e. if you use modelines in your simplenote notes, say to set the filetype, then as it was before if you opened those notes via simplenote.vim, vim would ignore the modeline and wouldn't do anything with it.  This commit will trigger vim to execute the modeline when a new Simplenote is created or updated.