bugfix: Wrong "Duration" in "Active Stages" in stages page

If a stage which has completed once loss parts of data, it will be resubmitted. At this time, it appears that stage.completionTime > stage.submissionTime.

Author: shiyun.wxm <shiyun.wxm@taobao.com>

Closes #170 from BlackNiuza/duration_problem and squashes the following commits:

a86d261 [shiyun.wxm] tow space indent
c0d7b24 [shiyun.wxm] change the style
3b072e1 [shiyun.wxm] fix scala style
f20701e [shiyun.wxm] bugfix: "Duration" in "Active Stages" in stages page

(cherry picked from commit d55ec86de2e96f7dc9d1dd107daa35c3823791ec)
Signed-off-by: Reynold Xin <rxin@apache.org>
SPARK-1203 fix saving to hdfs from yarn

Author: Thomas Graves <tgraves@apache.org>

Closes #173 from tgravescs/SPARK-1203 and squashes the following commits:

4fd5ded [Thomas Graves] adding import
964e3f7 [Thomas Graves] SPARK-1203 fix saving to hdfs from yarn
Update the yarn alpha version to 0.9.1-incubating-SNAPSHOT
[SPARK-1275] Made dev/run-tests executable.

This was causing Jenkins tests to fail for PRs against branch 0.9.

Author: Tathagata Das <tathagata.das1565@gmail.com>

Closes #178 from tdas/branch-0.9-fix and squashes the following commits:

a633bce [Tathagata Das] Merge remote-tracking branch 'apache-github/branch-0.9' into branch-0.9-fix
9b043cc [Tathagata Das] Made dev/run-tests executable.
[SPARK-1273] MLlib bug fixes, improvements, and doc updates for v0.9.1

Cherry-picked a few MLlib commits that are bug fixes, optimization, or doc updates for the v0.9.1 release.

JIRA: https://spark-project.atlassian.net/browse/SPARK-1273

Author: Xiangrui Meng <meng@databricks.com>
Author: Sean Owen <sowen@cloudera.com>
Author: Andrew Tulloch <andrew@tullo.ch>
Author: Chen Chao <crazyjvm@gmail.com>

Closes #175 from mengxr/branch-0.9 and squashes the following commits:

d8928ea [Xiangrui Meng] add Apache header to LocalSparkContext
a66d386 [Xiangrui Meng] Merge remote-tracking branch 'apache/branch-0.9' into branch-0.9
a899894 [Xiangrui Meng] [SPARK-1237, 1238] Improve the computation of YtY for implicit ALS
46fe493 [Xiangrui Meng] [SPARK-1260]: faster construction of features with intercept
6340a18 [Sean Owen] MLLIB-22. Support negative implicit input in ALS
f27441a [Chen Chao] MLLIB-24:  url of "Collaborative Filtering for Implicit Feedback Datasets" in ALS is invalid now
a26ac90 [Sean Owen] Merge pull request #460 from srowen/RandomInitialALSVectors
0564985 [Andrew Tulloch] Fixed import order
2512e67 [Andrew Tulloch] LocalSparkContext for MLlib
[SPARK-1285] Backporting updates to streaming docs to branch 0.9

Cherrypicked updates that have been added to master branch

Author: Aaron Kimball <aaron@magnify.io>
Author: Tathagata Das <tathagata.das1565@gmail.com>
Author: Chen Chao <crazyjvm@gmail.com>
Author: Andrew Or <andrewor14@gmail.com>

Closes #183 from tdas/branch-0.9-streaming-docs and squashes the following commits:

e1a988f [Tathagata Das] Added clean to run-tests
98c3e98 [Tathagata Das] Merge remote-tracking branch 'apache-github/branch-0.9' into branch-0.9-streaming-docs
d792351 [Chen Chao] maintain arbitrary state data for each key
e708f74 [Aaron Kimball] SPARK-1173. (#2) Fix typo in Java streaming example.
156bcd7 [Aaron Kimball] SPARK-1173. Improve scala streaming docs.
8849a96 [Andrew Or] Fix typos in Spark Streaming programming guide
fbd66a5 [Chen Chao] Merge pull request #579 from CrazyJvm/patch-1.
SPARK-1051. On YARN, executors don't doAs submitting user

This reopens https://github.com/apache/incubator-spark/pull/538 against the new repo

Author: Sandy Ryza <sandy@cloudera.com>

Closes #29 from sryza/sandy-spark-1051 and squashes the following commits:

708ce49 [Sandy Ryza] SPARK-1051. doAs submitting user in YARN
SPARK-1032. If Yarn app fails before registering, app master stays aroun...

...d long after

This reopens https://github.com/apache/incubator-spark/pull/648 against the new repo.

Author: Sandy Ryza <sandy@cloudera.com>

Closes #28 from sryza/sandy-spark-1032 and squashes the following commits:

5953f50 [Sandy Ryza] SPARK-1032. If Yarn app fails before registering, app master stays around long after

Conflicts:
	yarn/alpha/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala
	yarn/stable/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala
Bumped versions to Spark 0.9.1

Self explanatory!

Author: Tathagata Das <tathagata.das1565@gmail.com>

Closes #190 from tdas/branch-0.9-version-bump and squashes the following commits:

34576ee [Tathagata Das] Bumped versions to Spark 0.9.1
Removed incubating from Spark version in all the pom.xml.
use doi links in mllib-guide