Use THEME_STATIC_DIR instead of hardcoded 'theme'

The output folder for the theme can be changed via `THEME_STATIC_DIR` setting. But the assets plugin uses the harcoded `theme` string. This small patch makes the asset plugin use the setting.
Merge pull request #107 from graffic/patch-1

Use THEME_STATIC_DIR instead of hardcoded 'theme'
The `asset_url` needs to use also `theme_static_dir`

Sorry for this mistake, I was using harcoded paths in my template.

If the destination changes in the output folder (`THEME_STATIC_DIR`) also the URL used for the assets should change.
Update readme.rst

The name of the package in pip is `beautifulsoup4`, not `bs4`.
Merge pull request #108 from graffic/patch-2

The `asset_url` was also hardcoded instead of using `theme_static_dir`
DOC: nbconvert no longer necessary
Fix error message for IPython 2.0
Merge pull request #110 from jseabold/ipython-fixes

IPython cleanup
Merge pull request #109 from astrieanna/patch-1

Correct package name from bs4 to beautifulsoup4
Added feed summary plugin.
This plugin allows to use the `Summary:` metadata as feed contents.
Merge pull request #113 from florianjacob/feed_summary

Add feed summary plugin
Remove gzip references in Assets plugin README

gzip filter removed in:
https://github.com/miracle2k/webassets/commit/d0fb2414208353625ee04cf236e6961efdff8f59

Fixes #115
Read more link plugin -- initial commit
Adds THUMBNAIL_KEEP_NAME which if set puts the thumbnail in a folder named
like the key in THUMBNAIL_SIZES.
Escape "^" in the json file because it is a special character for tique search.
Also escape "^" for page tile in the tipue json file.
Update Readme.md
Update Readme.md
Merge pull request #119 from calfzhou/tipue

Escape "^" in the json file because it is a special character for tique ...
Update disqus_static.py

There is no '_' prefix for DEFAULT_CONFIG