add mirror project to compile against scala 2.10.4 and Play Json 2.2.3

framian-json-play artifact is now compiled against Play Json 2.3.1 for both Scala 2.10.4 and 2.11.1.
framian-json-play22 artifact is a special case just to support play 2.2.x a little longer
Merge pull request #20 from dwhjames/topic/play-json-cross-build

add mirror project to compile against Scala 2.10.4 and Play Json 2.2.3
Fix README.md libraryDependencies
Merge pull request #23 from ezhulenev/master

Fix README.md libraryDependencies
Refactor Quantile to avoid bug.

There was a bug in quantile causing it to return some percentiles that
were below the min value. This simplifies quantile and adds some sanity
tests to ensure we don't get this behaviour.
Merge pull request #24 from pellucidanalytics/fix/quantile

Refactor Quantile to avoid bug.
Add test for actual percentile correctness.
Remove unused min/max from test.
Merge pull request #25 from pellucidanalytics/fix/quantile

Add test for actual percentile correctness.
Add test coverage report using jacoco: sbt jacoco:cover
Merge pull request #26 from mrvisser/topic/jacoco-coverage

Add JaCoCo coverage reports: sbt jacoco:cover