Revert "Merge pull request #7 from shujuwen2013/add-new-chart-types"
Revert "Merge pull request #7 from shujuwen2013/add-new-chart-types"

This reverts commit 2619a49c8db4248cbc516e36263c4a79c0eddd86, reversing
changes made to 73ca8d3cea24ef5591872daea7465243e8ba6e73.

shujuwen2013/slamdata,shujuwen2013/slamdata