sbt 0.13.7
Fix deprecation warnings (method x in class PathFinder is deprecated: Use pair.)

[info] Compiling 5 Scala sources to /scalatra-sbt/target/scala-2.10/sbt-0.13/classes...
[warn] /scalatra-sbt/src/main/scala/org/scalatra/sbt/DistPlugin.scala:28: method x in class PathFinder is deprecated: Use pair.
[warn]       val jars = libs.descendantsExcept(GlobFilter("*"), excl) x flat(tgt / "lib")
[warn]                                                                ^
[warn] /scalatra-sbt/src/main/scala/org/scalatra/sbt/DistPlugin.scala:31: method x in class PathFinder is deprecated: Use pair.
[warn]         files x rebase(dir, tgt / "lib")
[warn]               ^
[warn] /scalatra-sbt/src/main/scala/org/scalatra/sbt/DistPlugin.scala:74: method x in class PathFinder is deprecated: Use pair.
[warn]         IO.copy(files x rebase(wr, tgt / "webapp"))
[warn]                       ^
[warn] /scalatra-sbt/src/main/scala/org/scalatra/sbt/DistPlugin.scala:83: method x in class PathFinder is deprecated: Use pair.
[warn]       val paths = files x rebase(tgt, nm)
[warn]                         ^
[warn] four warnings found
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Merge pull request #10 from seratch/sbt-0.13.7

Bump sbt 0.13.1 to 0.13.7