Fixes and enhancements

- When a xib/nib is deleted, the corresponding cib is deleted.
- Fixed the calculation of the output path when given a relative path.
- Works with .nib files now.
- Works with -R option now. NSCustomResource was assuming an image path would always be relative to cwd().
- The Resources directory is always inferred from the input path, so the -R option is usually unnecessary.
- Added --default-theme option.
- Multiple extra themes can be specified with the --theme option.
- Verbose mode displays the inferred application and resources paths, and the source theme used when doing font substitutions.
- Added a man page.
- Themes are read using StaticResource instead of parsing the file myself.
- Error message tweaks.

Tools/nib2cib/Converter.j

@@ -44,7 +44,7 @@ ConverterConversionException = @"ConverterConversionException";
     CPString     outputPath      @accessors;
     CPString     resourcesPath   @accessors;
     NibFormat    format          @accessors(readonly);
-    CPTheme      theme           @accessors(readonly);
+    CPArray      themes          @accessors(readonly);
 }
 
 + (Converter)sharedConverter
@@ -55,7 +55,7 @@ ConverterConversionException = @"ConverterConversionException";
     return SharedConverter;
 }
 
-- (id)initWithInputPath:(CPString)aPath format:(NibFormat)nibFormat theme:(CPTheme)aTheme
+- (id)initWithInputPath:(CPString)aPath format:(NibFormat)nibFormat themes:(CPArray)themeList
 {
     self = [super init];
 
@@ -63,7 +63,7 @@ ConverterConversionException = @"ConverterConversionException";
     {
         inputPath = aPath;
         format = nibFormat;
-        theme = aTheme;
+        themes = themeList;
     }
 
     return self;