[ffigen] Update public API (#70)

- Updated `Config`'s class members to use public getter, private variable pattern.
- Replaced ConfigError with FormatException.
- Refactored all shared global variables to data.dart.
- Send test coverage to coveralls in travis.
20 files changed
tree: 6cd5da77eb1aa4cf0eff1aeeb143401557d0af62
  1. pkgs/