Application Representation and Service

[romeara]

Create a service to read a representation of the current application. This allows future property storage, and use of the application instead of internal configuration in locations where application information is needed.

Switch datastore service to use application representation. This additionally allows for more consistent method signatures for operations on application data and the upcoming workspace and project data operations

[codecov-io]

Current coverage is 80.95% (diff: 82.75%)

Merging #17 into master will decrease coverage by 0.79%

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  Files             5          7     +2   
  Lines           126        147    +21   
  Methods           0          0          
  Messages          0          0          
  Branches         20         23     +3   
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+ Hits            103        119    +16   
- Misses           12         16     +4   
- Partials         11         12     +1   

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