avoid raw Types when dealing with scene2d Cell

add generic types to more things in Table.java

fix error

fix error again because im bad
Add VertexAttribute#type,#normalized,#hashCode()
Update proguard configurations to recommended values
Merge pull request #2019 from Unkn0wn0ne/proguard

Updated proguard configurations to recommended values
make changes suggested by Nate
Merge pull request #1998 from jrenner/cell-fix

avoid raw Types when dealing with scene2d Cell
Merge pull request #2015 from xoppa/various

Add VertexAttribute#type, #normalized, #hashCode(), .ColorPacked()
Update CHANGES
Merge pull request #2018 from JesseTG/master

Simple changes to the math package for convenience
Update Music.java