Fix wrong hostname display

This is a fix to issue #13.

The hostname in the top of the html was wrongly displayed. That was due
to hardcoded markup.

To fix the issue, I have added a new page handler, BaseHandler to handle
all of the dynamic features that are out of the scope of specific
handlers (such as the header, which is shared between all of the
handlers).

The base hadnlers listens to the route change event and updates shared
dynamic information.
Merge pull request #15 from dzautner/fix-wrong-hostname

Fix wrong hostname display
added fs api module
added method to get percentage of free disk space
added pie rendered plugin for jqplot
added an empty box template
added disk usage box
added disk usage box to main handler
Merge pull request #16 from dzautner/add-disk-chart

Add disk chart
added delete http request helper
added delete all to trace api
added clear all button
added remove all functionallity to trace points box
linked clear all button to remove all functionallity
set a minimum point of 0 to all trace graphs
Merge pull request #17 from dzautner/add-trace-clear-button

Add trace clear button
Merge pull request #18 from dzautner/trace-graphs-start-from-zero

set a minimum point of 0 to all trace graphs