Merge pull request #72 from edwardt/master

(minor improvement) Use variable for SparkR assembly versioning in Makefile; ignore folders and files generated in unit tests to avoid accidental checkins
Update Makefile (style uniformity)

Add a space for style uniformiity
Update README.md
Add where to enter bugs ad feeback
don't check in gedit buffer file'
Update README.md

rewording and remove some unnecessary sentence
Update README.md

further rewording per comment feedback
Update README.md

Add blank lines for better seperations
Update README.md

Move feedback toend of doc
Merge pull request #76 from edwardt/addjira

Add links to jira in README
Fix a bug that modifications to build.sbt won't trigger rebuilding.
Merge pull request #78 from sun-rui/master

Fix a bug that modifications to build.sbt won't trigger rebuilding.
Fix syntax error in examples/kmeans.R.
Adjust coding style.
Merge pull request #79 from sun-rui/fix-kmeans

Fix syntax error in examples/kmeans.R.
Add mapPartitions() method to RDD for API consistency.
Update Rd file and add a test case for mapPartitions.
Merge pull request #80 from sun-rui/master

Add mapPartitions() method to RDD for API consistency.
[SPARKR-117] Update Spark dependency to 1.1.0
Merge pull request #81 from sun-rui/SparkR-117

[SPARKR-117] Update Spark dependency to 1.1.0