Reynir

All abbreviation handling moved to the `Tokenizer` package. Moved large resources, such as the `ord.compressed` file, to `git-lfs` (Git Large File Storage). Made the tokenizer used by the `Reynir` class overridable.

Improved handling of adjective arguments (*tengdur flokknum*, *viðstödd sýninguna*, *frjáls ferða sinna*). Stricter and more accurate parsing of impersonal verbs; *Ég dreymi fílinn* no longer parses. Added `kind`, `cat`, `fl` and `leaves` attributes to `SimpleTree`. Added `config/BinErrata.conf` with almost 1.600 corrections to the BÍN `fl` data, which are applied when building the `ord.compressed` file.

Internal refactoring to support `ReynirCorrect`; small bug fixes

Updated mechanism for obtaining resource file names via `pkg_resources`, in order to better support inclusion of `reynir` as a dependency of other Python packages under Python 3.4 (seems not to be a problem on Python >= 3.5).

Updated composite word dictionaries (words such as _reynslulausn_ were not being identified as composite). Fixed bug in augmented terminal information, causing prepositions to show up incorrectly in hover cards in the `greynir.is` UI.

BÍN lookup now much faster, having been moved to a C++ module called via CFFI. Vocabulary and grammar expanded.