Some bower components (such as TinyMCE) require the user to use node
and npm to install build dependencies and build the static
components. This results in a node_modules, created by npm, directory
inside the bower component directory. This is a very large directory
not part of the final built static files. So ignore it.

Some third party js/css libraries installed through bower, contain
broken references in CSS: url(...). When using PipelineCachedStorage,
this breaks during collectstatic. As with AppDirectoriesFinder, ignore
CSS. CSS is a pielinable content that can be managed through a
pipeline asset.

True, these CSS fixes should be fixed in their respective
projects. Bugs have been filed, but this fix will allow pipeline users
to continue using third party libraries without breaking builds and
deployment.

check path first

PipelineStorage.listdir short-circuit returning the first match only

check if path is exists

Fix whitespace in script tags, remove charset attribute for inline scripts

Before:
<script   type="text/javascript" ...
<script async  type="text/javascript" ...
<script  defer type="text/javascript" ...
<script async defer type="text/javascript" ...

After:
<script type="text/javascript" ...
<script async type="text/javascript" ...
<script defer type="text/javascript" ...
<script async defer type="text/javascript" ...

The charset attribute is not valid for inline scripts:
"Element script must not have attribute charset unless attribute src is also specified."
http://dev.w3.org/html5/markup/script.html

Bumped django dependency

First example should probably say PipelineStorage

Fix incorrect PIPELINE_JS_COMPRESSOR setting in documentation

Adding a new company on the documentation (fixes #309).

The current code inserts bytes into a string. In Python 3 those are different types, causing the URI to look like:

    url("data:image/png;charset=utf-8;base64,b'iVBORw0KGgoAAAANSUhEUgAAAA...'")

Because Base64 data is always ASCII it is safe to decode it as such, and insert the resulting string, which causes the correct output:

    url("data:image/png;charset=utf-8;base64,iVBORw0KGgoAAAANSUhEUgAAAA...")

First example in documentation should refer to ordinary PipelineStorage rather than PipelineCachedStorage, which is covered in the "Cache-busting" section below.

Do not rewrite data URIs

Fixed spelling of my last name

If multiprocessing and concurrent unspported, render linear compilation.

Use generators and add a gzip support.

Signed-off-by: Timothée Peignier <timothee.peignier@tryphon.org>