This module contains the following classes:
- Fetches and inserts one or more script or link nodes into the document
- YUI user agent detection.
Do not fork for a browser if it can be avoided. Use feature detection when
you can. Use the user agent as a last resort. UA stores a version
number for the browser engine, 0 otherwise. This value may or may not map
to the version number of the browser using the engine. The value is
presented as a float so that it can easily be used for boolean evaluation
as well as for looking for a particular range of versions. Because of this,
some of the granularity of the version info may be lost (e.g., Gecko 188.8.131.52
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