Make photo classes implement Serializable

Make the following classes implement Serializable:

* Editability, Extras, GeoData, Note, Permissions, PhotoPlace,
  Rectangle, GeoPermissions, Tag
Expand all tabs to whitespace

No code changes (see diff -w)

Command used:

    find flickrj-android -name *.java |while read line; do expand -t 4 \
    -i $line > $line.new; mv $line.new $line; done
Fix ActivityInterface event parse bug

ActivityInterface assumed events will always have a "_content" value,
which is untrue for events of type "fave".

This caused a JSONException if one of these was present.

Also:
* Catch any type of Exception that could occur in this block (which I'm
  assuming was the original intent of the code), and print the stack
  trace.
Make activity classes implement Serializable

Make the following classes from the activity package implement
Serializable:

* Event, Item
[maven-release-plugin] prepare release flickrj-android-2.0.1
released 2.0.1 version to the Central repo
Merge branch 'master' of github.com:yuyang226/FlickrjApi4Android
released a 2.0.2 version to the Maven central repo
changed returntype for PhotosInterface.getFavourites
changed phtosetInterface
bump up the version
Add pagination for flickr.photos.getContactsPhotos

(also added as comment in the code):

The api docs don't mention that pagination for this method is supported.
However, looking at the json response from the api explorer it quite
clearly is.  I have tested and it works fine.

It's likely Flickr just need to update their docs, though this may
change in the future.
bug fix in PhotosInterface.getPerms
bug fix: getInfo@PhotosetsInterface now supports authed call to get the correct photo count
released v2.0.4 to the central repo
add 'in_commons' search parameter
Merge branch 'master' of https://github.com/yuyang226/FlickrjApi4Android
bug fix for search in commons project
add method in TagsInterface, getMostFrequentlyUsed and test
getList in PhotosInterface another version