Fixing URI::Find and Email::Find to ignore URI's and e-mail addys in HTML tags

Hi all! If you use URI::Find and Email::Find on "plain text" files -- and you sometimes encounter HTML HREF tags in these files, you know how these modules can mangle your output. So, here's a quickie fix to make the modules smarter.

Credit where credit is due -- suaveant reminded me about negative lookaheads last month when I was trying to highlight keywords in my site search output. This is the same concept -- and the same code! Thanks, dood!

Add the negative lookaheads:

# URI::Find line 124
#    $$r_text =~ s{(<$uriRe>|$uriRe)}{ # OLD
    $$r_text =~ s{(<$uriRe>|$uriRe)(?![^<]*[>\Z])}{ # NEW

# Email::Find line 59
#    $$r_text =~ s{($Addr_spec_re)}{ # OLD
    $$r_text =~ s{($Addr_spec_re)(?![^<]*[>\Z])}{ # NEW
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