Merge branch 'issues/SPARK-3063' into issues/SPARK-3036_3037

Squashed commit of the following:

commit 3ba41f2c6336acda124c3363dd82eec5de4ec5ed
Merge: 4d7bae2 cd0720c
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Tue Aug 19 16:41:05 2014 +0900

    Merge branch 'master' into issues/SPARK-3063

commit 4d7bae2911ba824fb9f981882669857d0f4e6753
Merge: 9321379 c77f406
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Mon Aug 18 14:45:25 2014 +0900

    Merge branch 'master' into issues/SPARK-3063

commit 93213793ec8c19156e5a2867e833d12b6b3af84a
Merge: d8a900a cc36487
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Sat Aug 16 09:14:04 2014 +0900

    Merge branch 'master' into issues/SPARK-3063

commit d8a900ad1408ea3662d2e43b2df24db485cd28e5
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Fri Aug 15 15:48:52 2014 +0900

    Make ExistingRdd.convertToCatalyst be able to convert Map value.
Merge branch 'issues/SPARK-2969' into issues/SPARK-3036_3037

Squashed commit of the following:

commit 24f1c5c4b483ab61adc937e0818b1fa144a4981d
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Tue Aug 12 19:41:10 2014 +0900

    Change the default value of ArrayType.containsNull to true in Python API.

commit 79f5b65c519299991db23baa6561400e9d76a599
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Tue Aug 12 19:40:39 2014 +0900

    Change the default value of ArrayType.containsNull to true in Java API.

commit 7cd1a7aae693539543eac7d9cc1f7efc57b89d0d
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Tue Aug 12 17:10:03 2014 +0900

    Fix json test failures.

commit 2cfb862c1d9161023c587a1a5b3d9294a4125b62
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Tue Aug 12 15:13:15 2014 +0900

    Change the default value of ArrayType.containsNull to true.

commit 2f38e612f4d4606117e0b97914b660d070b53f01
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Tue Aug 12 15:06:39 2014 +0900

    Revert the default value of MapTypes.valueContainsNull.

commit 9fa02f5952ff729ef7de2d86125b1efc77313ce0
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Mon Aug 11 23:34:42 2014 +0900

    Fix a test failure.

commit 1a9a96bf752dc33d19cb3654e05bc35c28b9ae08
Author: Takuya UESHIN <ueshin@happy-camper.st>
Date:   Mon Aug 11 19:46:24 2014 +0900

    Modify ScalaReflection to handle ArrayType.containsNull and MapType.valueContainsNull.
Add MapType containing null value support to Parquet.
Add ArrayType containing null value support to Parquet.