add version as table attribute
always write current version
REL: removing unused scripts
DOC: changelog mention
Merge pull request #518 from wasade/drop_dead_scripts

Drop dead scripts
add version tuple to __init__.py
change self.version ot self.format_version
Merge pull request #512 from teravest/issue510

ENH: Add version as attribute of Table
Updates format_version numbers on example tables
Merge pull request #522 from adamrp/bump_version_on_example_tables

Updates format_version numbers on example tables
Correct description of acceptable metadata types

Fixes #519
Merge pull request #520 from adamrp/issue-519

Correct description of acceptable metadata types