Merge pull request #877 from mateiz/docs

conf/spark-env.sh.template

docs/_layouts/global.html

docs/configuration.md

docs/css/bootstrap.min.css

docs/hardware-provisioning.md

docs/img/incubator-logo.png

docs/index.md

docs/mllib-guide.md

docs/python-programming-guide.md

docs/quick-start.md

docs/running-on-mesos.md

docs/running-on-yarn.md

docs/scala-programming-guide.md

docs/spark-standalone.md

pyspark

run-example

spark-class