update build documentation for #1 and #2

Author: dzc34

documentation/Howto-build.md

@@ -9,6 +9,7 @@ Tested on Linux Ubuntu 12.04 LTS
     sudo wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.7-linux-x86_64.tar.bz2
     sudo tar -xvf phantomjs-1.9.7-linux-x86_64.tar.bz2
     sudo rm phantomjs-1.9.7-linux-x86_64.tar.bz2
+    sudo ln -s /opt/phantomjs-1.9.7-linux-x86_64 /opt/phantomjs
 ```
 
 ## Howto build
@@ -21,4 +22,15 @@ Tested on Linux Ubuntu 12.04 LTS
 ### Build the sources
 
     cd /home/<user>/Web-Snapshot
-    mvn clean install
+    mvn clean install
+    
+
+> Waiting for an archiva, asqatasun must have previously
+> been built on the machine, in its 4.0.0-SNAPSHOT version (current develop branch).
+>
+> Once built, the dependencies will be copied in your local maven repository
+> and then, you'll be able to build the websnapshot.
+>
+> We know it's a bit dirty, but by now, it works
+#1
+