spark-submit: add exec at the end of the script

Add an 'exec' at the end of the spark-submit script, to avoid keeping a
bash process hanging around while it runs.  This makes ps look a little
bit nicer.

Author: Colin Patrick Mccabe <cmccabe@cloudera.com>

Closes #858 from cmccabe/SPARK-1907 and squashes the following commits:

7023b64 [Colin Patrick Mccabe] spark-submit: add exec at the end of the script

(cherry picked from commit 6e9fb6320bec3371bc9c010ccbc1b915f500486b)
Signed-off-by: Reynold Xin <rxin@apache.org>
[SPARK-1822] SchemaRDD.count() should use query optimizer

Author: Kan Zhang <kzhang@apache.org>

Closes #841 from kanzhang/SPARK-1822 and squashes the following commits:

2f8072a [Kan Zhang] [SPARK-1822] Minor style update
cf4baa4 [Kan Zhang] [SPARK-1822] Adding Scaladoc
e67c910 [Kan Zhang] [SPARK-1822] SchemaRDD.count() should use optimizer

(cherry picked from commit 6052db9dc10c996215658485e805200e4f0cf549)
Signed-off-by: Reynold Xin <rxin@apache.org>
Added PEP8 style configuration file.

This sets the max line length to 100 as a PEP8 exception.

Author: Reynold Xin <rxin@apache.org>

Closes #872 from rxin/pep8 and squashes the following commits:

2f26029 [Reynold Xin] Added PEP8 style configuration file.

(cherry picked from commit 5c7faecd75ea59454ad3209390ac078e6cf6e4a6)
Signed-off-by: Reynold Xin <rxin@apache.org>
SPARK-1822: Some minor cleanup work on SchemaRDD.count()

Minor cleanup following #841.

Author: Reynold Xin <rxin@apache.org>

Closes #868 from rxin/schema-count and squashes the following commits:

5442651 [Reynold Xin] SPARK-1822: Some minor cleanup work on SchemaRDD.count()

(cherry picked from commit d66642e3978a76977414c2fdaedebaad35662667)
Signed-off-by: Reynold Xin <rxin@apache.org>
Added license header for tox.ini.

(cherry picked from commit fa541f32c5b92e6868a9c99cbb2c87115d624d23)
Signed-off-by: Reynold Xin <rxin@apache.org>
[maven-release-plugin] prepare release v1.0.0-rc11
[maven-release-plugin] prepare for next development iteration