Fix specific occurrences rationale highlighting

#### Stories ####
- https://www.pivotaltracker.com/story/show/65112412
- https://www.pivotaltracker.com/story/show/65988280

#### Notes ####
- issues included misbehaving highlighting when switching between populations, and incorrect specific occurrence evaluations when applying rationale highlighting
- resolved misbehavior by passing updated result model to <code>logicView</code>
- resolved incorrect specific occurrence evaluations by preserving original population code (e.g., <code>IPP_1</code>, <code>NUMER_1</code>, etc.) in population model when parsing measure attrs
- resolved population switching incorrectly rendering toggle-icon on result in <code>populationCalculation</code> view

#### Screenshots ####
- **before** branch fixes
  - expand result
    - ![screen shot 2014-02-20 at 12 12 44 pm](https://f.cloud.github.com/assets/456952/2220845/52952f6c-9a52-11e3-87be-386e1fccab39.png)
  - switch population
    - ![screen shot 2014-02-20 at 12 12 58 pm](https://f.cloud.github.com/assets/456952/2220847/52993ee0-9a52-11e3-87b1-df28a55cf332.png)
  - trigger highlighting 
    - ![screen shot 2014-02-20 at 12 13 15 pm](https://f.cloud.github.com/assets/456952/2220846/529939c2-9a52-11e3-8e8e-01f0b5c01353.png)
- **after** branch fixes
  - 1st pop
    - ![screen shot 2014-02-20 at 12 10 45 pm](https://f.cloud.github.com/assets/456952/2220820/0191f80c-9a52-11e3-8116-28de6bde75b3.png)
  - 2nd pop
    - ![screen shot 2014-02-20 at 12 10 53 pm](https://f.cloud.github.com/assets/456952/2220819/01919678-9a52-11e3-9464-cc0c53f5ffa2.png)