Fix JIRA 235: Improve tachyon-start.sh script to format journal folders if -f flag is specified
Minor help text spelling changes.
Incorporate the feedback from David
Fix JIRA 235: Improve tachyon-start.sh script to format journal folders if -f flag is specified
Merge branch 'jira235' of https://github.com/Huawei-Tachyon/tachyon into jira235
Merge pull request #540 from Huawei-Tachyon/jira235

[Tachyon-235] : Improve tachyon-start.sh script to create/format the journal, data and work folder