Bump Application Version to 1.3.1

Updated versionCode and versionName for release of 1.3.1.
Database version downgrade from 7 to Version 6.

This commit will downgrade the database version from 7 to 6.
The newest app on the playstore is using version 5.

Note: I removed the Profile/friend table upgrade because this hasn't been pushed to the devices of our users.
So we only need to create the table.
Unify the API Interface

With all the new features, the old API wasn't working (popular, upcoming,
etc. on manga), so there wasn't much use in breaking the interfaces in
two anymore. Unify to one interface file and point to the temporary home
of the new API.
Friendlist redesign (using cards).

This design doesn't contain a line & has seperate cards.
It will be more understandable for the users and is using the same color scheme like the profile details.
Fix share(profile) using int(id) instead string.

The profile share function broke unexpected.
This fix will add getResources().getString() to the strings.
It won't return the id anymore but the string.
Ignore Thumbs.db files
Add icons to nav drawer items and make titles larger
Add bottom padding of 5dp to user name text
Get rid of forgotten commented lines
Replace forgotten old maketext methode(Home).

This was a old crouton message.
It was made by me because I was testing the profile and it wasn't debugging because I was using this instead Home.this.
So I temp. replaced it with a quick methode and forgot to replace it with a proper message.
Merge pull request #102 from xiprox/navdrawicons

Icons in the navigation drawer and some small changes
Replace the networkcheck & make the methode easy(Home/Drawer)

I made the conditions simple and replaced the network check.
DrawerItemClickListener/onItemClick
Removal BaseItemGrindFragement & support multiple pages(search).

I found out that the IGT & BIGT were basicly the same.
There was only a slight diffrence: the activity context.

Removed the do crouton methode and the booleans on SearchActivity.
The BaseActionBar is now using a static string for the query.
Bugfix 10 crouton messages when host/api is offline or doesnt exist.
Change card style and add touch feedback
Change second shadow color
Merge pull request #107 from xiprox/card-change

Change card style and add touch feedback
Merge pull request #98 from ratan12/Friendlist_redesign

Friendlist redesign (using cards).
Merge pull request #103 from ratan12/Replace_maketext_methode

Replace maketext methode & replace conditions drawer/onitemclick(Home)
Merge pull request #106 from ratan12/Search_&_IGF

Removal BaseItemGrindFragement & support multiple pages(search).