added underscore to request.svgTag regex

[LordPachelbel]

If an SVG file has an underscore character anywhere in its <svg> tag — e.g. id="Layer_1" — then one of the regexes in this plugin's $.ajax() callback returns false, and that prevents the SVG file from being inlined.

So I added _ to that regex.

[coveralls]

Coverage remained the same at 63.158% when pulling e5789fe on BrownBoots:master into 14687d2 on tiagoporto:master.

[LordPachelbel]

My change did some strange things, though. (I think so, anyway.) So I'm cancelling this.

[tiagoporto]

@LordPachelbel Could you tell me what happened? Maybe I can think in another solution.

[LordPachelbel]

When svgToInline() was called the resulting HTML would be a messed-up <svg> tag. I see now that my later commits put the _ in the wrong part of the regex, and it's possible our npm-grunt-bower build process ended up using the broken regex code. (I made those other commits because I didn't want to rebuild the project.)

Original regex:
request.svgTag = request.element.match(/<svg[\w\s\t\n:="\\'\/.#-]+>/g);

What I intended to do, and did correctly in the initial patch branch:
request.svgTag = request.element.match(/<svg[\w\s\t\n:="\\'\/.#-_]+>/g);

What I accidentally did in the other commits:
request.svgTag = request.element.match(/<svg[\w\s\t\n:="\\'\/.#-]+_>/g);

So maybe my original patch actually works fine.

[LordPachelbel]

(Sorry that I deleted the repo with my code in it!)