changed frequency scale on main spectrum to be start/center/stop (mfarhan request)
frequency labels now show 4 decimal places instead of 2
Merge pull request #1 from mfarhan12/start_stop_flabels

frequency labels now show 4 decimal places instead of 2
freq axis now has normal tick labels AND start/center/stop (no "Frequency" label)
make rtsa/spectrum_analyzer.py easily debuggable (ie: launchable without distutils entry point)
Merge remote-tracking branch 'remotes/pyrf/master' into start_stop_flabels

Conflicts:
	pyrf/gui/plot_widget.py
	pyrf/gui/spectrum_analyzer.py
fixed merge issues
added an extra digit to the frequency ticks in the power spectrum (hackorama)
Merge remote-tracking branch 'remotes/pyrf/master' into start_stop_flabels
Merge remote-tracking branch 'pyrf/master' into start_stop_flabels

Conflicts:
	pyrf/gui/plot_widget.py
remove tickStrings customization