Update Tachyon website UI and Tachyon Running Cluster UI

Align the logo and the version number with the titles.
fix a bug in TachyonURI
fix a TachyonURI bug
Update Tachyon Runtime WebUI

Add file status "Need Pin" to browse and memory page.
Merge remote-tracking branch 'upstream/master' into NeedPin
Merge pull request #240 from PasaLab/NeedPin

Update Tachyon Running Cluster U
UI Tweak
improve unit test for master ft; add more comments; fix minor bugs