Plot Memory Usage vs Time

[SinisterLight]

Plot memory Usage vs time for past week using stored info

[SinisterLight]

Need smarter scale while plotting

[SinisterLight]

@wallydrag Need memory info scale units to be KB or MB.
KB when <9999KB
MB when >=10000KB

[debaghtk]

Memory axis shows data in KBs, time is shown on x-axis, the current graph shows data for last 10 values.

[debaghtk]

Need to solve issue #46 and this issue will be over too.