UBJsonReader: Use buffered streams
- Extended UBJsonTest
- added  write (boolean append, int bufferSize) to FileHandle to get a buffered output stream
Fixed imports.
Merge pull request #1062 from hneuer/ubjsonperf

UBJsonReader: Use buffered streams
closes #1065
Merge pull request #1068 from JackSullivan/master

Added a float[] constructor to Matrix3 to match the ones on Matrix4.
User object.

closes #1070
Merge branch 'origin/master'
Don't use disabled background if there is none.