Sorting Hat 0.4 - (2017-07-17)

New features and improvements:

Mailmap and StackAlytics support.

Mailmap and StackAlytics files can be converted to Sorting Hat JSON
format using the new scripts mailmap2sh and stackalytics2sh.
Unify by sources.

Giving a list of sources, this option allows to unify command to
merge only those unique identities which belong to any of the given
sources.

Bugs fixed:

Encoding error generating UUIDs in Python 3. Some special characters
cannot be encoded in Python3. This caused function uuid() to fail
when converting those characters. 'surrogateescape' handler was
added to fix that problem.
Force utf8_unicode_ci collation on MySQL tables to fix integrity errors.
MySQL considers chars like β and b or ı and i the same, when
some collation values are set (i.e utf8_general_ci). This can raise
integrity errors when Sorting Hat tries to add similar identities with
these pairs of characters.

For instance, if the identity:
```
('scm', 'βart', 'bart@example.com', 'bart)
```
is stored in the database, the insertion of:
```
('scm', 'bart', 'bart@example.com', 'bart)
```
will raise an error, even when these identities have different UUIDs.
Forcing MySQL to use utf8_unicode_ci fixes this error, allowing
to insert both identities.

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