Fixing crashes by adding asserts for nil parameters when creating mocks.

Author: Nick Gravelyn

Source/OCMock/OCClassMockObject.m

@@ -26,6 +26,7 @@ @implementation OCClassMockObject
 
 - (id)initWithClass:(Class)aClass
 {
+    NSParameterAssert(aClass != nil);
 	[super init];
 	mockedClass = aClass;
     [self prepareClassForClassMethodMocking];

Source/OCMock/OCPartialMockObject.m

@@ -29,6 +29,7 @@ @implementation OCPartialMockObject
 
 - (id)initWithObject:(NSObject *)anObject
 {
+    NSParameterAssert(anObject != nil);
     [self assertClassIsSupported:[anObject class]];
 	[super initWithClass:[anObject class]];
 	realObject = [anObject retain];

Source/OCMock/OCProtocolMockObject.m

@@ -24,6 +24,7 @@ @implementation OCProtocolMockObject
 
 - (id)initWithProtocol:(Protocol *)aProtocol
 {
+    NSParameterAssert(aProtocol != nil);
 	[super init];
 	mockedProtocol = aProtocol;
 	return self;