Compliance with TOML v0.1.0.

- Added valid tests for escaped unicode characters.
- Added invalid tests for old '\xXX' characters.
- Added valid test for 'key=value' (no spaces).
- Added invalid tests for for '[' and ']' in key group names,
  as per mojombo/toml/issues/158.
Version info for toml-test and version update for TOML