Elm-fluent

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* Big rewrite of the type inference/checking mechanism, with more accurate
error messages now.

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* Updated to Syntax 1.0 (fluent.syntax 0.15)
* Various bug fixes and small improvements

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* ftl2elm --include option
* Dropped Python 2.7 support

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* Syntax 0.8 support, including parameterized terms.
* Better compile-time resolution of some expressions.

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* Fixed python-fluent dependency to an older version (< 0.9), because it
doesn't work with newer versions. Thanks stasm for the report.

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* Better handling for a large variety of error conditions
* Proper fallback mechanism implemented
* Added ``--watch`` option.
* Eliminate unused imports from generated code
* Various bug fixes:

* Avoid outputting ``.elm`` files with no exports
* Bugs with HTML attributes and non-string message args
* Crasher with multi-line messages
* Crasher when a message is missing from default locale