minor fix to labeltext unit tests
update comments and add highlight handling to LabelIndex & LabelText
create IBottom and ITop interfaces for layering brix, & a general DataPoint type
make LabelGroup implement the ITop layering interface
Add new pearson.utils.DataCoordinate type and use it in axes
implement IBottom on LineGraph and BarChart

- fix unit tests broken by new DOM tree
- add sample templates that appends a labelgroup to a linegrah and a barchart
FIX: misalignment of the check in ".brixMultipleChoiceQuestion i"
Change 1.0.0-rc version to release 1.0.0 version
Merge branch 'PreProduction'

Conflicts resolved by using master version:
	Makefile
	src/pearson/pearson.js
Merge pull request #62 in BRIX/brixclient from 678_layered-brix to master

# By Mike Lippert
# Via Mike Lippert
* commit '58f6961978319ead3c9e950bb67dd4dbc0650126':
  implement IBottom on LineGraph and BarChart
  Add new pearson.utils.DataCoordinate type and use it in axes
  make LabelGroup implement the ITop layering interface
  create IBottom and ITop interfaces for layering brix, & a general DataPoint type
  update comments and add highlight handling to LabelIndex & LabelText
  minor fix to labeltext unit tests