Whitelisting of extensions for consoles

[Spongeroberto]

This small edit allows you to supply a number of accepted file extensions for consoles.

When checking for roms, Ice will validate the file path against the whitelist. If no extensions are entered, or the extensions parameter in consoles.txt is omitted, all roms will be accepted.

Reasons to use this:

• Avoid double entries for games that come in a bin/cue pair
• Avoid double entries for Wii games; For big games, images can be split in a .wbfs file and .wbf1, .wbf2, etcetera. By just adding 'wbfs' to your extensions parameter
• Avoid adding savestates / memory cards / ram files as duplicates of your game

My apologies for the unnecessary edits with line breaks - a result of my using Linux. I'll see about fixing that for future pull requests :)

[marcusmoller]

You probably should just remove them from your commit.
I am not certain, but I fear that your recent commit (Spongeroberto@5dfea65) might just remove the content within emulators.txt, consoles.txt and config.txt of the master branch.

[scottrice]

nit: os.path provides a helper function to split a file extension away from a path. The function you want is

http://docs.python.org/2/library/os.path.html#os.path.splitext

Please change the logic to check if it ends with the extension to use this function. It should look something like:

(Note: no guarantees on the one-liner tuple syntax)

return any(path.endswith(os.path.splitext(path)[1]) for x in self.extensions.split(' '))

Also, would you make the list comma-separated instead of space-separated? It's sort of a personal preference, but I feel that commas convey the concept of a list much better than spaces do.

[Spongeroberto]

Extensions list may now be comma delimited (I trim each extension too for good measure). Also I don't ruin the existing config files this time around.

My apologies for the mess - I've always been a lurker rather than a contributor