Add test for Wedding functions.

Fix conflicts in Messages.java
Fix conflicts in UntagCommand.java
Fix conflicts in AddressBookParser.java
Fix conflicts in AddressBook.java

Fix check style issues in Wedding classes.
Fix check style issues in Wedding test classes.

Add tests for UnassignWeddingCommand.

Add tests for AssignWeddingCommand.

Add tests for DeleteWeddingCommand.

Add tests for CreateWeddingCommand.

# Conflicts:
#	src/main/java/seedu/address/logic/Messages.java
#	src/main/java/seedu/address/logic/commands/AssignWeddingCommand.java
#	src/main/java/seedu/address/logic/commands/CreateWeddingCommand.java
#	src/main/java/seedu/address/logic/commands/DeleteWeddingCommand.java
#	src/main/java/seedu/address/logic/commands/UnassignWeddingCommand.java
#	src/main/java/seedu/address/model/AddressBook.java
#	src/main/java/seedu/address/model/Model.java
#	src/main/java/seedu/address/model/ReadOnlyAddressBook.java
#	src/main/java/seedu/address/model/person/Person.java
#	src/main/java/seedu/address/model/wedding/UniqueWeddingList.java
#	src/main/java/seedu/address/model/wedding/Wedding.java
#	src/main/java/seedu/address/model/wedding/WeddingName.java
#	src/test/java/seedu/address/logic/parser/CreateWeddingCommandParserTest.java
#	src/test/java/seedu/address/logic/parser/DeleteWeddingCommandParserTest.java
#	src/test/java/seedu/address/model/AddressBookTest.java
#	src/test/java/seedu/address/testutil/TypicalPersons.java

Remove setTag from UniqueWeddingList.java.

Bug fix for compatibility with Weddings in
EditPersonDescriptorBuilder.java.