isolating the bitmask functions from spark by moving under Octeres.Bitmask

src/main/scala/Octeres/Bitmask/BitmaskLite.scala

src/main/scala/Octeres/DataUDF.scala

src/test/python/test_timeline.py

src/test/scala/Octeres/Bitmask/BitmaskLiteTest.scala

src/test/scala/Octeres/DataUDFTest.scala