Delta multiplier added to Editor Properties.
New emitters are configured as bare-boned skeletons.

Initial emitter remains the same however.
Add ScreenAdapter.java for GWT
Create ScreenAdapter.java
Update NetJavaImpl.java

issue 1576
Update Net.java
Update IOSNet.java
Added Rectangle functionality

Added the ability to calculate the aspect ratio and center position, as
well as centering to a point, and fitting inside/outside another
rectangle
calculate -> get and returns
Forgot to change centerTo->setCenter and more chains
Don't allow null selected nodes.
AssetLoader changed to receive the resolved FileHandle along with the file name.

See comments in #517.
Sync GWT emulation with changes in f3b2d34
Added bleed setting to fix linear filtering with non-premultiplied alpha. Removed duplicate padding setting.
Merge branch 'origin/master'
AssetLoader changes.
returns the matrix4 from lerp() to allow chaining
Merge pull request #527 from g-pechorin/patch-1

returns the matrix4 from lerp() to allow chaining
Model/Mesh builder small changes
Merge pull request #525 from JonECG/rectangle

Added Rectangle functionality