A filter that would combine duplicate style="..." into a single css class and 
assign that class to elements using the style.

Example:
<p style="text-align:left; color: red; background: blue;">FOO</p>
<p style="text-align:left; color: red; background: blue;">BAR</p>
<p style="text-align:left; color: red; background: blue;">BAZ</p>
Length:197

Converted To:

<style>.mps23456546{text-align:left;color:red;background:blue}</style>
<p class="mps23456546">FOO</p>
<p class="mps23456546">BAR</p>
<p class="mps23456546">BAZ</p>
Length: 163