MySQL has a packet limit of 1MB as a default
(http://dev.mysql.com/doc/refman/5.0/en/packet-too-large.html).
This interferes with the UPDATE queries required
to add file content caches. Since the query can't be terminated
correctly, the whole content will be discarded with a query error.
This change allows to truncate content prior to the UPDATE operation,
and defaults to 500 characters. This leaves some room for multibyte
characters as well as other parts of the SQL query.
API Implement support for detection via mime-type as well as file extension
API Implement FileContent property for safe usage in templates
API instead of returning the list of extensions / mime types supported, support is determined on a per-file bases
Marking dev-master as version 2.0 as this contains breaking changes
