Formatting
New test case for concurrent reading (threading)
Drop file handlers caching
Small cleanup
Update the 'tailoring atexit hooks' recipe to be compatible with the new FileRegistry
_FileRegistry now inherits from 'object' (see gh-314)
Update internal blosc to v1.3.2
Update sw versions in the doc
Merge branch 'avalentino-nofilecache' into develop

Conflicts:
	RELEASE_NOTES.txt
	tables/file.py
	tables/tests/test_basics.py
Dealing with .gitignore issues
WIP merging new blosc
Added support for Blosc 1.3 series, including new compressors
Merge branch 'blosc-newcompressors' of https://github.com/FrancescAlted/PyTables into blosc-newcompressors