Add Manage activity, list item, menu.

Also add action bar icons to drawable folders. Rename activity_main_spinner to spinner_item.
Add functionality to Manage activity, change main menu item to start Manage activity, add manage item layout.
Change typo
Fix bug which made Manage activity show only one item because of match_parent in item relativeLayout
Add Data List in Manage activity which is automatically updated with the views.
Add catch if user enters nothing in the port editText.
Add TODO.
Compile app.
Modify build.gradle
Merge branch 'Manage'
Add ServerHelper sql class, begin working on ServersDataSource dao
ServerHelper working perfectly, Manage and Main activity both using it. Remove DataSource and integrate it in ServerHelper.
Rename ServerHelper to ServerDataBase, change inputTypes in add server dialog.
Merge branch 'Sql'