Assorted code cleanups and fixes

[smpeters]

• there were a few places where toString() was called on String objects
• the equals() method in the ViewHolder static class in LegislatorListFragments could generate ClassCastExceptions
• removed several spots where the code claimed CongressExceptions could be thrown but actually didn't
• used Java 5 style for loops with various collections instead of older style for and while loops
• removed public and static modifiers off of interfaces since they don't do anything
• removed some unnecessary casting and local variable creation for returns

[konklone]

Thank you for doing this! I really appreciate it. Are you looking at using the code for something?