Revert "remove gfs"

This reverts commit ee07614ffbc7127dc9dd4f57b072a412e4d75b16.
add glusterfs configuration setting info
switch glusterfs repo to sonatype
fix line length
add information to 'In Memory Files' page
remove main/dependency-reduced-pom.xml
add tachyon/web/UiFileInfo.java
delete main/dependency-reduced-pom.xml
delete *.swp
delete unused imports
enable glusterfs unit test profile
add glusterfs minicluster test
Merge pull request #220 from uronce-cc/master

add information to 'In Memory Files' page
format
add hadoop-client v2 as glusterfs test dependency
Add main/dependency-reduced-pom.xml to .gitignore which generated file from maven shade.
fix UI: host/browse or host/browse? or host/browse?(anything except 'path') will crash due to NullPointerException
fix UI: set invalid offset in display file will crash, offset should be numbers and should be in range [0, size(file)]
fix UI: display file may crash due to IOException
change to more accurate error information