Fix Invalid query error when using non-hosted graph

[modersohn]

• as described in hosted services on thegraph are being sunsetted eventually #50 - the non-hosted graphs don't like unused query parameters
• removed block from query completely, was never used
• if no typename is provided, delete the lines in the query
• added new tests for GetTransactions

[fudgebucket27]

There is an issue when going into the block details page. The transactions don't show up for the block and it has this error in the GetTransactions method in the LoopringGraphQLService class:

"{"errors":[{"locations":[{"line":7,"column":17}],"message":"Invalid value provided for argument whereFilter: Object({"typename": String("19525")})"}]}"

Looks like it's to do with the typename in the where filter

[fudgebucket27]

I've just pushed a fix for the block transactions not showing and added a new unit test for block transactions. i will merge this into dev and do some tests online. then will merge into master