Merge pull request #1 from mweastwood/squashed_maketraviswork

Define a non-trivial test and make testing work on Travis
interface improvements for creating measures and interacting with tables

* Make it possible to define quanta with a string macro
* Custom type for handling measurement sets
* Custom types for the various kinds of measures
* Implement get/put methods for data, model data, and corrected cols
* Methods for adding and removing rows/columns from tables
* Define a basic test for tables manipulation