vim:deoplete: assorted changes
vim:deoplete: assorted changes

- Re-arrange priorities of completion types
- Disable ignore_case and camel_case, smart case is enough for now
- Remove sorters entry, this was causing issue in getting right
  completion entries.
- Disable previous handling of <Esc> key to close popup-menu
- Modify check_back_space() function as per reference setting

Signed-off-by: Ratheesh S <f847af0ee3590f4912d169b886f309989d9e4c2e@gmail.com>

ratheesh/dot-files,ratheesh/dot-files