So frequently does New York-based independent filmmaker Simon (Tristan Turner) repeat the shaggy one-line pitch for the documentary he’s working on — it’s “a nostalgia-piece travelogue about past, present and future, a eulogy for lost history” — that he’s probably long stopped thinking about what it actually means. If, indeed, it means anything at all. Simon’s life, too, has taken on the same unexamined shapelessness, as the early-thirtysomething keeps waiting for some undefined break, breakthrough or eureka moment, while doing very little to make it happen for himself. An unassuming but perceptive debut feature from writer-directors Travis Wood and Alex Mallis , “ The Travel Companion ” observes an artist’s supposedly roving spirit critically at odds with his manchild dependencies. Which isn’t to say it’s an unsympathetic portrait. Gradually rolling out across the U.S.…