Remove unused tests and add asserts for not implemented parts in code generation.

quick fix on christian's rational

change so that ubuntu will stop yelling

be more specific with rational declaration for Windows sake

rational in namespace correction for windows

libsolidity/ast/Types.cpp

@@ -32,7 +32,6 @@
 using namespace std;
 using namespace dev;
 using namespace dev::solidity;
-using rational = boost::rational<bigint>;
 
 void StorageOffsets::computeOffsets(TypePointers const& _types)
 {
@@ -769,8 +768,8 @@ shared_ptr<FixedPointType const> RationalNumberType::fixedPointType() const
 	unsigned fractionalBits = 0;
 	rational value = abs(m_value); // We care about the sign later.
 	rational maxValue = negative ? 
-		rational(bigint(1) << 255):
-		rational((bigint(1) << 256) - 1);
+		rational(bigint(1) << 255, 1):
+		rational((bigint(1) << 256) - 1, 1);
 
 	while (value * 0x100 <= maxValue && value.denominator() != 1 && fractionalBits < 256)
 	{