added files to installer, better file selection

Diff for: installer.cfg

@@ -12,5 +12,5 @@ version=2.7.13
 packages = serial
      intelhex
 
-files = tinyfpgab.py
-
+files = b-series/programmer/tinyfpgab.py
+     a-series-programmer/python/tinyfpgaa.py

Diff for: tinyfpga-programmer-gui.py

@@ -329,8 +329,7 @@ def select_bitstream_file_cmd():
     filename = tkFileDialog.askopenfilename(
         title = "Select file", 
         filetypes = [
-            ('FPGA Hex Files', '.hex'), 
-            ('FPGA JEDEC Files', '.jed'), 
+            ('FPGA Bitstream Files', ('.hex', '.jed')), 
             ('all files', '.*')
         ]
     )