add google analytics to 1.10.0

[mattip]

@brianjo

For future reference, the way I did this is to write the snippet to a file, say foo, and then do

$ for f in $(find docs/1.10.0 -name '*.html'); do sed -i -e"/^.*modernizr.min.js.*$/r foo" $f; done

This finds all the html files in docs/1.10.0, and for each one, after a line containing modernizr.min.js, appends the contents of foo.

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