minor fixes as per michael's request
Merge branch 'michael-0921_z' of github.com:zathras-crypto/mastercore into michael-0921_z
Merge branch 'michael-0921' of github.com:mastercoin-MSC/mastercore into michael-0921_z
Merge branch 'michael-0921' of github.com:mastercoin-MSC/mastercore into michael-0921_z
Modify listtransactions_MP to support a start and end block height
Merge pull request #67 from zathras-crypto/michael-0921_z

listtransactions_MP mod to allow start and end blockheights