Fix name resolution for intersphinx links

[adiroiban]

See #124

The root problem is Documentable.expandName but I was not able to fix its implementation.
See #125 for more details.

I went with a dirty hack.

I have also increased the release number, so once this is merged we can create a tag and release a new version.

[codecov-io]

Current coverage is 60.36% (diff: 100%)

Merging #126 into master will increase coverage by 0.02%

@@             master       #126   diff @@
==========================================
  Files            20         20          
  Lines          3293       3295     +2   
  Methods           0          0          
  Messages          0          0          
  Branches        700        701     +1   
==========================================
+ Hits           1987       1989     +2   
  Misses         1105       1105          
  Partials        201        201          

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[glyph]

@adiroiban - I want to say "add a test case for this" but somehow this just increases coverage already? :)

[adiroiban]

I start writing unit tests for Documentable.expandName ... but I found out that I had no idea what is going on there and how to write a proper fix and proper tests for it.

with a previous branch I have added functional end-to-end tests by running pydoctor against Twisted trunk...so we do have tests for this change... just that they are not unit tests and not easy to follow.

so, I can write a unit tests for translate_identifier_xref ... but the problem is that I don't really know what is wrong here and how to write the docstring for the test

[glyph]

@mwhudson - any help?

[hawkowl]

Since this has 100% coverage, and it fixes an issue, and we don't really know any better way than yoloing it... sure, let's go with this.