CB-9544 Add file plugin for OSX (closes apache#130)

- use applications resource path for the `applicationDirectory` to match other platforms expectation where the 'www' directoy is

Author: tripodsan

README.md

@@ -190,7 +190,8 @@ properties are `null`.
 
 | Device Path                                      | `cordova.file.*`            | `iosExtraFileSystems` | r/w? |  OS clears | private |
 |:-------------------------------------------------|:----------------------------|:----------------------|:----:|:---------:|:-------:|
-| `/Applications/<appname>.app`                    | applicationDirectory        | bundle                | r    |     N/A   |   Yes   |
+| `/Applications/<appname>.app/`                   | -                           | bundle                | r    |     N/A   |   Yes   |
+| &nbsp;&nbsp;&nbsp;&nbsp;`Content/Resources/`    | applicationDirectory        | -                     | r    |     N/A   |   Yes   |
 | `~/Library/Application Support/<bundle-id>/`     | applicationStorageDirectory | -                     | r/w  |     No    |   Yes   |
 | &nbsp;&nbsp;&nbsp;&nbsp;`files/`                 | dataDirectory               | -                     | r/w  |     No    |   Yes   |
 | `~/Documents/`                                   | documentsDirectory          | documents             | r/w  |     No    |    No   |

src/osx/CDVFile.m

@@ -452,7 +452,7 @@ - (void)requestAllFileSystems:(CDVInvokedUrlCommand*)command
 - (void)requestAllPaths:(CDVInvokedUrlCommand*)command
 {
     NSDictionary* ret = @{
-        @"applicationDirectory": [[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]] absoluteString],
+        @"applicationDirectory": [[NSURL fileURLWithPath:[[NSBundle mainBundle] resourcePath]] absoluteString],
         @"applicationStorageDirectory": [[NSURL fileURLWithPath:self.appSupportPath] absoluteString],
         @"dataDirectory": [[NSURL fileURLWithPath:self.appDataPath] absoluteString],
         @"documentsDirectory": [[NSURL fileURLWithPath:self.appDocsPath] absoluteString],