Giraph - How to build this site in maven

Summary

We build this site with Maven using the fluido plugin. Due to difficulties with the maven site plugin and munge working together, we build the site using a profile that does not require munge.

Start at the parent directory and do
```
mvn -Phadoop_2 clean site -DskipTests
```
Then we need to stage this site since it has multiple modules with
```
mvn -Phadoop_2 site:stage -DskipTests
```
You can check the results of the site building and staging in
```
target/staging
```
and then deploy as necessary.
To deploy, check out the site from svn with
```
svn co https://svn.apache.org/repos/asf/giraph/site
```
. Remove everything and then copy the staged site to the directory and then commit. All changes should be live immediately.