Use ActiveAndroid for models, get rid of OurJSONObject.

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# Author:    Gopal Venkatesan <gv@g13n.me>
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#	modified:   build.gradle
#	modified:   twitterclient/build.gradle
#	modified:   twitterclient/src/main/java/me/g13n/twitterclient/activities/ComposeActivity.java
#	modified:   twitterclient/src/main/java/me/g13n/twitterclient/activities/TwitterAppActivity.java
#	modified:   twitterclient/src/main/res/layout/tweet_item.xml
#	modified:   twitterclient/src/main/res/menu/main_menu.xml
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#	modified:   twitterclient/src/main/java/me/g13n/twitterclient/adapters/TweetsAdapter.java
#	modified:   twitterclient/src/main/java/me/g13n/twitterclient/models/Tweet.java
#	modified:   twitterclient/src/main/java/me/g13n/twitterclient/models/User.java
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