Fix "Invalid character entity" with illustrator svgs #272 #476
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Makes external entities declared in doctype known to the sax parser in svgo. This allows the source file to be saved in illustrator with preserved editing capabilities. Added a very basic test to check and sample file to check whether the parser runs through. Shouldn't have too many side effects.
Note: there are activities around entity parsing going on in the sax parser itself, see isaacs/sax-js#162. But it doesn't seem to have high priority. I think putting a (maybe temporary) fix in svgo is useful because the workflow Illustrator -> SVG -> SVGO -> Grunt Webfont is quite common.