front-end: Use select2 from node_modules and stop bundling it select2 3.5.4 was added in 304e83e9bcde ... but the latest npm release in the 3 series is 3.5.1, so we use that one instead. We should probably upgrade to the 4 series. The select2 images were not in the location the generated css pointed - now we copy them from node_modules to the right location, next to the generated css. Note: this will drop 190cb30841de "branches: fix performance of branch selectors with many branches - only show the first 200 results" ... but it should no longer be relevant now when we use server side filtering. 15e507047bae introduced select2-bootstrap.css - it is not clear what version was used, but we use the latest 1.4.6 which also is very old.

Babel >= 0.9.6, < 2.7
pytest >= 3.3.0, < 3.8
pytest-runner < 4.3
pytest-sugar >= 0.7.0, < 0.10
pytest-benchmark < 3.2
pytest-localserver < 0.5
mock < 2.1
Sphinx < 1.8
WebTest < 2.1
WebOb >= 1.7, < 1.8 # turbogears2 2.3.12 requires WebOb<1.8.0, WebTest has WebOb>=1.2