Fix release 79

[iskandr]

• Ensembl 79's GTF added another surprise: entries in the last column with multiple spaces. This isn't really their fault, since the spaces were within quotes. Added a bandaid fix, but need to implement a real parser before Ensembl 80 comes out.
• Added some missing biotypes.
• PEP8 fixes in gtf_parsing
• Fixed FASTA path for protein sequences for Ensembl releases <= 75

[tavinathanson]

Comments from the review on Reviewable.io

Reviewed files:

• pyensembl/biotypes.py @ r1
• pyensembl/gtf.py @ r1
• pyensembl/gtf_parsing.py @ r1
• pyensembl/transcript.py @ r1
• pyensembl/url_templates.py @ r1
• setup.py @ r1

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Looks good, just a minor comment or two.

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^{pyensembl/gtf.py, line 338 [r1] (raw file):} Get rid of the True comment?

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^{pyensembl/gtf_parsing.py, line 164 [r1] (raw file):} I'm confused, and assume I'm just misreading. If the maxsplit that generated pairs is 2, how did we get more than 2 elements? (Edit: oh, the number of elements is maxsplit + 1!)

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