We use `pep8` to check for code formatting in the hgvs module.  Can you also follow those guidelines in this PR?

```
$ pep8 hgvs
hgvs/__init__.py:615:29: E127 continuation line over-indented for visual indent
hgvs/__init__.py:635:80: E501 line too long (86 > 79 characters)
hgvs/__init__.py:635:29: E127 continuation line over-indented for visual indent
hgvs/__init__.py:1068:25: E127 continuation line over-indented for visual indent
hgvs/__init__.py:1069:21: E127 continuation line over-indented for visual indent
hgvs/__init__.py:1076:23: E127 continuation line over-indented for visual indent
hgvs/__init__.py:1077:23: E127 continuation line over-indented for visual indent
hgvs/__init__.py:1375:80: E501 line too long (85 > 79 characters)
hgvs/__init__.py:1374:25: E127 continuation line over-indented for visual indent
hgvs/__init__.py:1375:25: E127 continuation line over-indented for visual indent
hgvs/__init__.py:1396:80: E501 line too long (110 > 79 characters)
hgvs/__init__.py:1409:80: E501 line too long (80 > 79 characters)
hgvs/__init__.py:1409:18: E127 continuation line over-indented for visual indent
hgvs/models.py:47:80: E501 line too long (102 > 79 characters)
hgvs/utils.py:74:16: E251 no spaces around keyword / parameter equals
hgvs/utils.py:74:18: E251 no spaces around keyword / parameter equals
```