add TimeUtilsTest.java
Merge branch 'master' of github.com:libgdx/libgdx
GWT TimeUtils emulation
add TimeUtils test instance to GWT
with(...) methods for collections.

Constructors with varargs would have been too easily confused.
Merge pull request #1377 from jrenner/master

add a test for new stuff in TimeUtils
Background for List.

Since even Label had it.
Merge branch 'origin/master'
Added first() set methods.