add doc on glusterfs configuration
glusterfs configuration: fix reference link
Merge pull request #246 from rootfs/gfs-doc

Document Glusterfs configuration
in unit tests, if the temp environment folder already exists, remove it.
remove the testing folder after each unit test
integration test bug fix
revert MFT test as the previous version
Add TACHYON_MASTER_JAVA_OPTS for Master and TACHYON_WORKER_JAVA_OPTS for Worker to the default TACHYON_JAVA_OPTS.
fix a test bug
Update comment in the env template file.
further improve unit tests
Add JAVA_OPTS for Master and Worker for the GlusterFS.
Merge pull request #250 from hsaputra/separate_JAVA_OPTS_for_Master_and_Worker

Add TACHYON_MASTER_JAVA_OPTS for Master and TACHYON_WORKER_JAVA_OPTS
Remove  from  definition in tachyon-glusterfs-env.sh.template because it will be added later.
Merge pull request #251 from hsaputra/remove_JAVA_from_glusterfs_template

Remove $TACHYON_JAVA_OPTS from $JAVA definition in tachyon-glusterfs-env.sh.template file
Merge remote-tracking branch 'upstream/master'