Fix internationalization and localization of ScoreTypes
Improve RankingWebServer

Mostly unicode handling, coding style and PEP8.
Fix some updaters.

We now expect all strings in imported dumps to be unicode.
Remove the commit parameter in SessionGen().

It was only meant as a transition help. Commits must always be explicit.
Fix small details after the introduction of ProxyService.
Add a missing commit (closes #182).
Move translation evaluation to view layer

Many important strings, like SubmissionResult.compilation_text,
Evaluation.text, UserTestResult.(compilation|evaluation)_text were not
translatable. They contained a lot of information (outcomes, time and
memory measures, stdout and stderr of the compiler, filenames, etc.)
which was formatted into them "deeply" inside CMS: by TaskTypes running
on the Worker, and then transmitted via Jobs to EvaluationService that
stored them in the database. Thus, fixing it required a lot of changes
throughout the codebase.

The compilation_text was split across many fields (_time,
_wall_clock_time, _memory, _stdout, _stderr), keeping only the outcome
in _text. All of the outcome fields now contain a JSON-encoded list
whose first element is a string with placeholders and whose other
elements (if any) are the data to fill in it. This allows the string to
be translated *by the frontend* before being formatted and shown.
Translate the login page of CWS
Some details missed when ProxyService was introduced

Fixes c6769524516683280bd1da5527619dc588084cf8.
Fix LICENSE.txt

MIT is ambiguos, Expat isn't and it is a keyword recognized in the file
format specification [1].

[1] http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Fix token rules text when gen_time is less than 1 min.

Fixes #143.
Change the --light behavior of ContestExporter/Importer

Avoid it skipping testcases, and rename it to --no-generated as it's a
better description.
Small improvements to cms.io
Small improvements to a couple of services
Add reference to development mailing-list in the README
Some fixes and improvements.
Fix ES not storing compilation stats.
Removed duplicate proxy service in cms.conf.sample.
Cloning gevent with an address that does not require auth.
Making it easier to debug why testsuite fails.