[i18n] update german translation

Closes #392
Move search repo classes to new ui.search package
Add skeleton classes for SearchActivity and Search Fragments
Create tab pager for repos/users search fragments
Remove unneeded files
Fix SearchActivityTest
Implement search for a particular user
Implement requery from SearchActivity
Add SearchUser model class
Implementation of SearchUserService

SearchUserService is an extension to UserService
with methods for users search using Search API
UI for searching users

Add SearchUserListAdapter, support for SearchUser class in
AvatarLoader
Rename searchable meta-data
Merge pull request #318 from atermenji/search_user

Implement users search
Use 4 space indent in all layout files
Upgrade to http-request 5.4.1
Upgrade to wishlist 0.9
Use NO_WRAP flag to prevent newlines in filename
Remove unneeded curlies
Delete when user avatar directory path is already a file
Prepare 1.7 release