Merge pull request #9 from ktf/pr9

Fix locking
Tests seem ok.

Merge pull request #8 from sy-c/master

dropped python 2.7 support

[lla] Make thread safe

[lla] Release lock on session destruction

[lla] CRU locking granularity

[lla] InfoLogger use transparent

[session] Disable InfoLogger for ReadoutCard

[session] Disable per-session InfoLogger handle

[doc] Update README.md