docs: added PyPI badges to README
Automatically create download directory if missing
replaced unneeded function calls

No need to get call `os.path.dirname(fp)` as target directory
exists as data `_dir` data attribute of `DirectoryOAIHarvester`
added DEBUG message when creating target dir
Merge branch 'hotfix/1.1.2'

Closes #4
Merge tag '1.1.2' into develop

Release 1.1.2 - Auto create download directory
docs: updated README and CHANGES files
bumped version numbers
Merge tag '1.1.2' into develop

Release 1.1.2 - Auto create download directory

Conflicts:
	setup.py