allow other than scala.html templates

[gaydenko]

On attempt to open scala.txt template I get

java.lang.IllegalArgumentException: Expected to open file with extension scala.html, found some.scala.txt.
    at org.scalaide.editor.CompilationUnitProvider.getFile(CompilationUnitProvider.scala:29)
    at org.scalaide.editor.CompilationUnitProvider.fromEditor(CompilationUnitProvider.scala:19)
    at org.scalaide.play2.templateeditor.TemplateConfiguration.getTextHover(TemplateConfiguration.scala:125)

[vnicolici]

I have the same issue. Please remove this validation.

My reason for renaming it to .scala.txt is that the template engine doesn't have a mkString equivalent for Html, and using the mkString from String results in undesired escaping of apostrophes.

And no, the Html helper doesn't seem to help when your template text is multi line and contains curly braces, like this:

  @serieArray = {
      @chart.series.map { serie => {
          {
              type: 'area',
              name: '@serie.description',
              pointInterval: @chart.interval * 1000, // seconds
              pointStart: @toJavascript(chart.date),
              data: @serie.values
          }
      } }.mkString(",")
  }

After fighting it for a few hours I switched to txt to be able to use the mkString function without escaping.