Add spellfile support

[wikimatze]

Hi Reed,

I finally found the time to add the desired feature: Make it possible to add custom spellfile for each project.

Here is an example how to use it:

command -nargs=0 BookEnglisch call lexical#init({
                    \ 'spell': 1,
                    \ 'spelllang':  ['en'],
                    \ 'dictionary': ['/usr/share/dict/words'],
                    \ 'thesaurus':  ['~/.vim/thesaurus/mthesaur.txt'],
                    \ 'spellfile':  ['~/.vim/spell/en.utf-8.add'],
                    \ })

command -nargs=0 BookGerman call lexical#init({
                    \ 'spell': 1,
                    \ 'spelllang':  ['de_20'],
                    \ 'dictionary': ['~/.vim/spell/gerspchk.dict'],
                    \ 'thesaurus':  ['~/.vim/thesaurus/openthesaurus.txt'],
                    \ 'spellfile':  ['~/.vim/spell/de.utf-8.add'],
                    \ })

Hope everything is ready for a merge.

Bests

Matthias

[reedes]

That's a great addition. Thanks!

[wikimatze]

Can you make a v1.1 release?

[reedes]

Done

[wikimatze]

Thanks again.