Issue240 fixed

[gilbertogalvis]

This PR fix the issue #240.

to test it please use following code:

theta = 0:0.01:2*pi;
rho = sin(2*theta).*cos(2*theta);
polarplot(theta,rho)

fig2plotly(gcf, 'offline', 0, 'TreatAs', 'polarplot');

NOTE: it is necessary to use TreatAs Plot Option as 'polarplot'

results looks as follow

[VolKa79]

Getting warnings:
catch at line 643 in plotlyfog.m file
catch at line 155 in updateData.m file
catch at line 155 in updateData.m file
catch at line 660 in plotlyfog.m file
catch at line 671 in plotlyfog.m file

but as understood its for future TODO.

Matlab figure doesnt have angle mark while plotly does, but think its even looks better