Posthtml Parser breaks if '<' used within script

[dmorejon]

For example, in the code for (let i=0; i < 12; i++ {, Posthtml's parser will break this string up into strings, then putting them into separate elements in the tree.content array.
The hacky solution for now is just to concatenate the tree.content array before doing any other transformation on that node.

There is a regression test in testInjectScripts.js for this on the offending test file.