Update tomlEscape definition
Add support for multi-line basic strings
Add highlighting for literal strings
Improve table highlighting

 - Rename tomlKeyGroup to tomlTable as that's what they're called in
   the spec now.

 - Don't allow []# as the table name. Having a # there produced invalid
   highlighting before.

 - Add separate highlighting for arrays of tables. Bracket errors won't
   be highlighted now (example: `[[foo]`).
Update the toml revision and links in the README
Merge pull request #3 from lluchs/toml-update

Update syntax for current TOML version