Cleaned out the tests folder. Added simple test gerber. Added simple unit test using the GUI.

tests/gerber_files/simple1.gbr

@@ -0,0 +1,54 @@
+G04 MADE WITH FRITZING*
+G04 WWW.FRITZING.ORG*
+G04 DOUBLE SIDED*
+G04 HOLES PLATED*
+G04 CONTOUR ON CENTER OF CONTOUR VECTOR*
+%ASAXBY*%
+%FSLAX23Y23*%
+%MOIN*%
+%OFA0B0*%
+%SFA1.0B1.0*%
+%ADD10R,0.047244X0.078740*%
+%ADD11C,0.024000*%
+%LNCOPPER1*%
+G90*
+G70*
+G54D10*
+X2940Y1051D03*
+X2940Y941D03*
+G54D11*
+X2438Y839D02*
+X2440Y1023D01*
+D02*
+X2940Y907D02*
+X2941Y839D01*
+D02*
+X2941Y839D02*
+X2438Y839D01*
+D02*
+X2941Y1239D02*
+X2940Y1085D01*
+D02*
+X2438Y1239D02*
+X2941Y1239D01*
+D02*
+X2440Y1126D02*
+X2438Y1239D01*
+G36*
+X2418Y1064D02*
+X2461Y1064D01*
+X2461Y1017D01*
+X2418Y1017D01*
+X2418Y1064D01*
+G37*
+D02*
+G36*
+X2418Y1131D02*
+X2461Y1131D01*
+X2461Y1084D01*
+X2418Y1084D01*
+X2418Y1131D01*
+G37*
+D02*
+G04 End of Copper1*
+M02*