Fix context error in sources

Fix the documentation

Merge pull request #1068 from Shougo/revert-1047-msgpack-remove_encod…

…ing_opt

Revert "Remove `encoding` and `unicode_errors` option from Packer and Unpacker"

Remove deoplete#refresh()

Ver 5.0 release

Version 4.1

Merge pull request #823 from e-kwsm/improve-doc

Improve the documentation [ci skip]

Fix enable_loggin error

Merge pull request #533 from kiryph/doc-faq-reordered

Structure deoplete-faq into four sections

Fix the tests error