add more TachyonURI unit tests
rename local variabl name in TachyonURITest:toStringTests()
removed log4j prop from pom
unify expressions in TachyonURITest:constructFromParentAndChildTests
add more tests to TachyonURITest:getSchemeTests()
refactor TachyonURITest:compareToTests() to loop test
add more tests to TachyonURITest:equalsTests() and refactor to loop test
add '>' and '==' tests to TachyonURITest:compareToTests()
Merge pull request #267 from uronce-cc/TachyonURIUnitTest

TachyonURI unit tests
update unit tests
Update the "Running Spark on Tachyon" docs

Add a section to "Running Spark on Tachyon", which is about how to
persist Spark RDDs into Tachyon.
Merge pull request #270 from PasaLab/docs-Spark-OFF_HEAP

Update the user documentation "Running Spark on Tachyon"
improve Persist Spark RDDs into Tachyon doc
prepare to release 0.5.0
revert back to the last commit. do the release work in the release branch
Merge pull request #268 from dcapwell/remove-logprop-in-pom

removed log4j prop from pom
add network utils to get local ip/hostname
Merge branch 'master' of github.com:amplab/tachyon