Switch to strict mode and fix this usage issue
          #516
        
          
      
                
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Fixes #324 (allowing lunr.js import as module and usage in other strict environments) by switching lunr itself to strict mode and fixing
thisusage.wrapper_endwas updated to the latest version of template, which usesselfto access window and thus works in strict mode.lurn.utils.warnwas changed as in #411.Added tests check conditional usage of console. Tests succeed in both Node and browser.