fix(reporters): format fix for console log

fix to issue caused when colors was disabled. change to base reporter
string formats for single and multi browser logs, so they have the same
placeholders as in base_color.js.

tested with chrome, firefox and phantomjs

Closes #934

lib/reporters/base.js

@@ -121,8 +121,8 @@ var BaseReporter = function(formatError, reportSlow, adapter) {
 
   this.USE_COLORS = false;
 
-  this.LOG_SINGLE_BROWSER = 'LOG: %s\n';
-  this.LOG_MULTI_BROWSER = '%s LOG: %s\n';
+  this.LOG_SINGLE_BROWSER = '%s: %s\n';
+  this.LOG_MULTI_BROWSER = '%s %s: %s\n';
 
   this.SPEC_FAILURE = '%s %s FAILED' + '\n';
   this.SPEC_SLOW = '%s SLOW %s: %s\n';