Fix projection doc
Merge remote-tracking branch 'origin/master' into projection-doc
Tweak doc
Removed =undefined for optional parameters
Merge pull request #1723 from AnalyticalGraphicsInc/undefined

Removed =undefined for optional parameters
Merge pull request #1721 from AnalyticalGraphicsInc/projection-doc

Fix projection doc
Merge pull request #1725 from abwood/terrainCredits

Removed default credits when constructing the CesiumTerrainProvider.
added new czm_depthRangeStruct and czm_depthRange constant.
fixed typo in capitalization
Merge pull request #1726 from gbeatty/glDepthRange

Gl depth range
Fix whitespace
Check for missing parameters
Remove comments
Add pragma checks
Remove extra newline in comments
Merge pull request #1712 from andre-nunes/math

Check for missing parameters
Minor cleanup after merging #1712
Merge remote-tracking branch 'agi/master' into issue1434

Conflicts:
	Source/Core/GeometryAttribute.js
	Source/Core/GeometryInstanceAttribute.js
	Source/Core/PolylineGeometry.js
	Source/Core/SimplePolylineGeometry.js
	Source/Renderer/Context.js
	Source/Renderer/createShaderSource.js
	Source/Scene/Polygon.js
	Source/Scene/TextureAtlas.js