fix: use copy()
Fix outputs

change: not use g:ctrlp#buftab#ingore_pattern if empty
add   : introduce themis.vim & scall.vim
add   : .themisrc
add   : testcases
change: refactoring variable names
change: scope of dot_pattern (script-local -> local)
add   : s:remove_empty_bufname()
change: not display buffer if buffer name empty