add docs/_themes
- correct error when building docs in Sphinx:
Warning, treated as error:
~/projects/pyramid/pyramid/docs/api/i18n.rst:6: WARNING: error while formatting arguments for pyramid.i18n.TranslationStringFactory: 'function' object has no attribute '__bases__'
Merge pull request #1236 from stevepiercy/master

Allow 1.5b docs to be built in Sphinx
Apply change from #1221 manually.

Avoid the unintentional slight in OPs commit message.
- Add more git submodule instructions
- Add steps to fork and clone Pyramid to GitHub repo, then clone user GitHub repo to local machine.
Merge pull request #1238 from stevepiercy/master

- Add more git submodule instructions
Specified installation instructions for pyramid_chameleon
- Clean up PR #1163
Merge pull request #1239 from stevepiercy/master

Clean up PR #1163
- Update list of session packages
- Update Quick Tour section on sessions
- Closes PR #1150
Merge pull request #1240 from stevepiercy/master

- Update list of session packages
- Garden PR #1121
Merge pull request #1241 from stevepiercy/master

Garden Sphinx directives
Fix pserve --reload on Py3 (the simple solution)

This is the simpler fix for `pserve --reload` (so please pull either https://github.com/Pylons/pyramid/pull/1244 or this).

Basically with some project setups the reloader thread is guaranteed to crash on Python 3 as the main thread is importing modules in the other thread.
Merge pull request #1245 from ztane/patch-2

Fix pserve --reload on Py3 (the simple solution)
Changelog for PR #1245.
Clarify reasons for preferring easy_install over pip.