Following issues fixed.
1) Start Time & End time are sent in proper format to the backend(UTC & 'now, now-300s) wherever applicable.
2) Positions of the VMs in a underlay path and/or trace flow are changed to appear right below the vrouter to
which they belong to respectively and on clearing the graph restored their old positions.
Merge pull request #32 from rajreddy/webui

Following issues fixed.