Improve ViPER/ PingER

Minor Modifications 

• Needs help menu to be added that points towards the documentation.
• The sites on the top left corner needs to be identified.
• Graphs show up too slow, need to improve this.
• Zoom has a problem that needs to be corrected.
• Need to explain the coloring of the links.
• Select SLAC to CERN no data -- Bug.
• Add regions to sites/country table.
• Allow sorting of sites/country table.
• Add more metrics.
• Update the documentation on www.slac.stanford.edu/comp/net/wan-mon/viper
• Add PingER site list to help menu. 

Major Improvements 

• Add transparent graphs to regions using (Java Analysis studio) PingWorld is an example demo.
• Color various regions according to there performance.
• Provide detail information of beacon sites in Detail table.