GeoSpark v0.5.2-Spark-1.x

GeoSpark 0.5.2 is a maintenance release on GeoSpark 0.5.X. This release is compatible with Apache Spark 1.X line.

Bug fix: Fix Issue #58 and Issue #60; Performance enhancement: (1) Deprecate all old Spatial RDD constructors. See the JavaDoc here. (2) Recommend the new SRDD constructors which take an additional RDD storage level and automatically cache rawSpatialRDD to accelerate internal SRDD analyze step