Optimized Gerber parser. Some minor improvements to Excellon parser.

tests/profile_gerber_parser.py

@@ -0,0 +1,8 @@
+import os
+os.chdir('../')
+
+from camlib import *
+
+g = Gerber()
+g.parse_file(r'C:\Users\jpcaram\Dropbox\CNC\pcbcam\test_files\PlacaReles-F_Cu.gtl')
+