Implementing peaking biquad filter coefficient computation on the dummy_server (for sending back to the client later)

The client needs to take the results of this computation and then use it to draw the graph
Moving coefficient computation work into the client.
Fixing clear bugs due to lack of coffeescript expertise.
  - ko.computed requires a function
  - constructors still require the 'new' keyword
Fixing coefficient computation and in addition setting up the invocation of the "redraw" mechanism for the filter visualization
Moved redraw listening to the FilterView instead of the Filter model since the View is what will ultimately have access to the UI elements
Checkpointing Filter visualization work. Something is going on with the magnitude calculation because everything is being calculated as NaN.
Fixed magnitude value aggregation computation. Was multiplying incorrectly.
Made frequenices a member field of Eq.
Fixed rendering of filter visualization.
Remove special cases for out-of-bounds frequency and Q, since we'll never hit them.
Normalize frequencies.
Merge branch 'filter-graph'