mysql-test/r/mysqldump.result:
  added test for 
  bug #2592 mysqldump doesn't quote "tricky" names correctly
  please note, output's still looking wrong because of bug #2593
  it will be fixed when fix for bug #2593 will be pushed
mysql-test/t/mysqldump.test:
  added test for bug 
  #2592 mysqldump doesn't quote "tricky" names correctly
sql/sql_lex.cc:
  fixed processing of multibyte quoted variables