Sign in with

A little revamp of the sign in button. Basically #1157

![screen shot 2013-07-16 at 11 56 15 pm](https://f.cloud.github.com/assets/43325/809736/346c09fa-ee97-11e2-8f2a-2c545484450c.png)

**Other notes:**

- SASS' convention is to start a file's name with `_` if it's a partial, not meant to be compiled on its own.
- Added Bootstrap's dropdown module, only!
- We should probably have a compile step for production and just serve the file uncompressed/unminified in development. Would help with the debugging.

I couldn't take more screenshots since I can't run the app anymore. Some dependencies are not being met ever since I rebased with master. I ran `make db` before, but no luck.

I doubt this is due to my branch. But here's what I get:

```
...
pid-60504 thread-140735195500928 (MainThread) Renderers (*ed are unavailable, CAPS is default):
pid-60504 thread-140735195500928 (MainThread)   TORNADO
pid-60504 thread-140735195500928 (MainThread)  *pystache         ImportError: No module named pystache
pid-60504 thread-140735195500928 (MainThread)   stdlib_template
pid-60504 thread-140735195500928 (MainThread)   stdlib_format
pid-60504 thread-140735195500928 (MainThread)  *jinja2           ImportError: No module named jinja2
pid-60504 thread-140735195500928 (MainThread)   stdlib_percent
pid-60504 thread-140735195500928 (MainThread) Oh no! Aspen crashed!
pid-60504 thread-140735195500928 (MainThread) Traceback (most recent call last):
pid-60504 thread-140735195500928 (MainThread)   File "/Users/jgn/projects/www.gittip.com/env/lib/python2.7/site-packages/aspen/server.py", line 125, in main
pid-60504 thread-140735195500928 (MainThread)     _main(argv)
pid-60504 thread-140735195500928 (MainThread)   File "/Users/jgn/projects/www.gittip.com/env/lib/python2.7/site-packages/aspen/server.py", line 51, in _main
pid-60504 thread-140735195500928 (MainThread)     website = Website(argv)
pid-60504 thread-140735195500928 (MainThread)   File "/Users/jgn/projects/www.gittip.com/env/lib/python2.7/site-packages/aspen/website.py", line 30, in __init__
pid-60504 thread-140735195500928 (MainThread)     self.configure(argv)
pid-60504 thread-140735195500928 (MainThread)   File "/Users/jgn/projects/www.gittip.com/env/lib/python2.7/site-packages/aspen/configuration/__init__.py", line 382, in configure
pid-60504 thread-140735195500928 (MainThread)     execfile(filepath, {'website': self})
pid-60504 thread-140735195500928 (MainThread)   File "/Users/jgn/projects/www.gittip.com/configure-aspen.py", line 90, in <module>
pid-60504 thread-140735195500928 (MainThread)     UPDATE_HOMEPAGE_EVERY = int(os.environ['UPDATE_HOMEPAGE_EVERY'])
pid-60504 thread-140735195500928 (MainThread)   File "/Users/jgn/projects/www.gittip.com/env/lib/python2.7/UserDict.py", line 23, in __getitem__
pid-60504 thread-140735195500928 (MainThread)     raise KeyError(key)
pid-60504 thread-140735195500928 (MainThread) KeyError: 'UPDATE_HOMEPAGE_EVERY'
^Cpid-60504 thread-140735195500928 (MainThread) Received INT, exiting.
```