improve time needed for listing notes
improve time needed for listing notes

- Threads are used for fetching single notes
- more funcitonality into functions
- better use of list comprehensions

sanchon/simplenote.vim,sanchon/simplenote.vim,mrtazz/simplenote.vim,kidpixo/simplenote.vim,yuex/simplenote.vim,mrtazz/simplenote.vim