relocate the Utils into the package 'tachyon.util'
Merge branch 'amplab' into utils-fix
format the style of some imports
Merge branch 'amplab' into utils-fix

Conflicts:
	src/main/java/tachyon/UnderFileSystemHdfs.java
merge the branch "amplab"
format the imports of utils related files
format the imports
Merge pull request #78 from jinntrance/master

relocated all the Utils into package 'tachyon.util'