Install instructions without Eclipse for Android

With this installation instructions I could manage to install the plugin without Eclipse (Cordova 3.5.0, Mac OS X)
Merge pull request #546 from sebastianzillessen/master

Installation Instructions for Android without Eclipse (only CLI)
added iOS SDK 3.15.1
added Android SDK 3.15.0
updated SDK versions in README, updated plugin version to 0.6.1
Merge pull request #548 from aogilvie/update/sdks

Update/sdks
fixed issue from https://github.com/phonegap/phonegap-facebook-plugin/issues/220
Merge pull request #549 from aogilvie/fix/apprequests-returns-invalid-JSON

fixes issue
updated and simplified readmes
updated readmes
fixed typo
Merge pull request #550 from aogilvie/update/readmes

updated and simplified readmes
Added support for Share Open Graph dialogs.
Added support for simple Share dialog.
Merge pull request #556 from subtleknife/Add-Share-Dialog

Add Android support for Share and Share_Open_Graph dialogs
added missing message param - issue #559
Return object instead of just postId - issue #559
Merge pull request #566 from aogilvie/fix/js-message-check

added missing message param - issue #559
Merge pull request #567 from aogilvie/fix/js-ui-response-object

Return object instead of just postId - issue #559
Added guide for creating a WebApp with Parse.com