Fix BoxList constructor call in README.md

* Add missing __init__.py files

* Add packages

* Rename logging.py to logger.py

Import rules from Python2 makes this a bad idea

* Make import_file py2 compatible

* list does not have .copy() in py2

* math.log2 does not exist in py2

* Miscellaneous fixes for py2

* Address comments

Access repos via https in INSTALL.md

It is simpler and requires less effort (i.e. no auth) compared to SSH

Fix a small typo

Add ISSUE_TEMPLATE for Github

Update INSTALL.md

* Update .gitignore

* Update .gitignore