update readme
authors
core: detect invalid secret answer
typo
cosmetic
use logging
core: fix #20
logging: remove old logs on every import (__init__.py)
logging: set main logger default level flag to WARNING
add new exception Conflict
init docs
docs: index page
docs: add missing files
docs: conf imports variables from library
docs: add intersphinx extension
docs
docs: fix install
docs: fix install
docs: fix install
readme: add documentation link
move logging code from __init__ to log
core: fix #20