* Pull latest fontloader

    * up-to-date version of the TL 2015-style loader
    * enhanced support for font feature definitions (keeping TL2014 compat)

* Several bugfixes and improvements:
    * Weird substitution feature behavior: #309
    * Letterspacing: #310
    * Not fixed, but not crashing any more: #303

Special thanks to: @eroux, @priyadarshan, @rpfei74, @orchidee2
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