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)
Dealing with .gitignore issues
WIP merging new blosc
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
Version bump (v3.1.0rc1)
Draft announce (pytables 3.1.0)
Updated release timeline
Added support for Blosc 1.3 series, including new compressors
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
Deleted the old blosc sources