exclude E123 in a new version of PEP8

issues: #27
extract fetchall/fetchone function to utils submodule

issues: #27
remove blank line

issues: #27
allow to work with empty query set

issues: #27
model for AB testing

issues: #27
command for initializing AB testing group

issues: #27
environment for AB testing

issues: #27
adjust target probability according to the previous success rate

issues: #27
random question selection strategy

issues: #27
remove blank newline

issues: #27
cleaning code

issues: #27
remove obsolete openshiftlibs

issues: #27
the first part of A/B testing framework

issues: #27