Modify QueryParam
Merge pull request #102 from amkkun/QueryParam

QueryParamの改造
Improve TextConversionException's error message.
Fix #103: error of RunInstances with NetworkInterfaces
Fix #103: Change type of macaddr in InstanceNetworkInterface.
Add DescribeDhcpOptionsTest.
Add CreateDhcpOptionsTest
Add DescribeSnapshotAttributeTest.
Add CreateSnapshotTest.
ver.0.8.0.0
Add {Create,Delete,Replace}Route
Improve display of QueryParams in ec2QueryDebug.
Add rdsQueryDebug.
Add DescribeDBSnapshots.
Add CreateDBSnapshot.
Add DeleteDBSnapshot.
Add a test case for DescribeDBInstances.
Add DBSnapshot module into cabal file.
Add a test case for DescribeDBSnapshot.
Add a test case for {Create,Delete}DBSnapshot.