Fixed more issues found by findbugs
set tachyon.web.resources to PathToCore/src/main/webapp before initilize TachyonMaster in LocalTachyonMaster
TACHYON-210 Checkstyle check fails if you run inside a core module.
Merge pull request #505 from SiyuanHe/set_webapp_dir_tachyon-185

[Tachyon-185] set tachyon.web.resources to PathToCore/src/main/webapp before initilize...
clear tachyon.web.resources property when closing LocalTachyonMaster
Merge pull request #506 from hsaputra/TACHYON-210_fix_location_checkstyle_suppression

TACHYON-210 Checkstyle check fails if you run inside a core module.
Merge pull request #503 from dcapwell/morefindbugissues

Fixed more issues found by findbugs