zsxwing 6dfe38a03a [SPARK-4397][Core] Cleanup 'import SparkContext._' in core ... This PR cleans up `import SparkContext._` in core for SPARK-4397(#3262) to prove it really works well. Author: zsxwing <zsxwing@gmail.com> Closes #3530 from zsxwing/SPARK-4397-cleanup and squashes the following commits: 04e2273 [zsxwing] Cleanup 'import SparkContext._' in core		2014-12-02 00:18:41 -08:00
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main	[SPARK-4397][Core] Cleanup 'import SparkContext._' in core	2014-12-02 00:18:41 -08:00
test	[SPARK-4397][Core] Cleanup 'import SparkContext._' in core	2014-12-02 00:18:41 -08:00