Merge pull request #28 from interpretivechaos/master

Fixes bug with processors without parameterEditors
Remove updateParameterButtons from RecordNode::setParameter
Put scaling factor back into FileReaderThread
Temporarily add config loading to UIComponent initializer
Allow SpikeDisplayCanvas to draw multiple waveforms and projection plots
Update zoom factor on ProjectionAxes
Remove automatic state loading from UIComponent
Add logic for draggable threshold slider
Remove changing cursor (causing bugs on OS X)
Pulling from github
Removes updateParameterButtons from AudioNode

Removed the call to updateParameterButtons from audionode, which leads
to crash when adjusting the volume on slider.

The problem is that updateParameterButtons can't be called from any
editor that doesn't use the parameterEditors array. While this can be
fixed by just removing the call from all the processors, ideally there
would be a more robust way to check if it's used. Checking if
parameterEditors.size()==0 seems to catch it some times, but other
times seems to cause a crash. I'm not sure why it doesn't work: the
constructor for Juce Arrays specifies that numUsed should be equal to
zero for an unused Array, and parameterEditors should exist for all
editors that inherit from GenericEditor.