Update to JSON.NET 4.5r10

Also fix a few failing tests.  I believe the test fixes were unrelated and simply the result of us not running them as often as we should.
Merge pull request #34 from AnalyticalGraphicsInc/Json.NET

Update to JSON.NET 4.5r10
Updated README.md
initial pass of MultiTrack support.
tests and tweaks for GxMultiTrack.
function rename for consistency.
updates based on code review.
Merge pull request #37 from AnalyticalGraphicsInc/MultiTrack

Multi track support
Fixed JSON Schema Validator error
Merge pull request #38 from AnalyticalGraphicsInc/jsv

Fixed JSON Schema Validator error
Update README.md
fix to multitrack to allow for altitudeMode=absolute when track has no altitudeMode specified.
Add `resolution` property to Path.jsonschema

1. Resolution provides a maximum step size, in seconds, for the CZML implementor to take when sampling the `position` property for path visualization.
2. Everything else is just due to java translation using latest CS2Java.
Merge pull request #41 from AnalyticalGraphicsInc/issue40

fix to multitrack
Merge remote-tracking branch 'origin/master' into pathResolution
Merge pull request #42 from AnalyticalGraphicsInc/pathResolution

Add `resolution` property to Path.jsonschema
writers for DynamicEllipse.
add Ellipse schema file.
Add `outlineWidth` property to Label.
changes to ellipse writer to just use bearing, semimajorAxis and semiMinorAxis.