[mediaqueries] Move tests to a subfolder

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rename : contributors/florian/submitted/mq-calc-001-ref.html => contributors/florian/submitted/mediaqueries-calc/mq-calc-001-ref.html
rename : contributors/florian/submitted/mq-calc-001.html => contributors/florian/submitted/mediaqueries-calc/mq-calc-001.html
rename : contributors/florian/submitted/mq-calc-002.html => contributors/florian/submitted/mediaqueries-calc/mq-calc-002.html
rename : contributors/florian/submitted/mq-calc-003.html => contributors/florian/submitted/mediaqueries-calc/mq-calc-003.html
rename : contributors/florian/submitted/mq-calc-004.html => contributors/florian/submitted/mediaqueries-calc/mq-calc-004.html
rename : contributors/florian/submitted/mq-calc-005.html => contributors/florian/submitted/mediaqueries-calc/mq-calc-005.html