Update to enable group write permissions to the
tachyon.worker.data.folder to fix issue #123
Update on issue #123 per review to use internal utilities and avoid Java
7 dependencies.  The permissions were not still restricted to 775.
Removal of hard-tabs on issue #123 and update comment block
Merge remote-tracking branch 'upstream/master' into tachyon-123

Conflicts:
	src/main/java/tachyon/util/CommonUtils.java
Merge pull request #128 from timothysc/tachyon-123

Update to enable group write permissions to the tachyon.worker.data.folder