gitignore: editor bak files
(cherrypicked) remove duplicate constant definition
assert.throws isn't someone very special; address it like all the other assert.xyz methods.
Merge pull request #148 from GerHobbelt/pullreq-4

Pullreq 4 - (cherrypicked) remove duplicate constant definition
Merge pull request #145 from GerHobbelt/pullreq-7

Pullreq 7 - assert.throws isn't someone very special; address it like all the other assert.xyz methods.
Revive old web/jison graphs and tables, see also #156