avoid method name conflict

specs2 mutable specification has "p" and "t" method
https://github.com/etorreborre/specs2/blob/SPECS2-2.3.11/core/src/main/scala/org/specs2/specification/FormattingFragments.scala#L8
https://github.com/etorreborre/specs2/blob/SPECS2-2.3.11/core/src/main/scala/org/specs2/specification/FormattingFragments.scala#L11

see 06fa69cd265edb5506e780c7ab20492d45c73b3b