add bomb class
add sound class and sound files
Game Model Unit Tests
add sounds effects for language change, wrong connection, and correct connection;
fix the bug that cannot go to the second level (need to initialize the total level at the beginning);
add the button of the levelviewcontroller in code, and segue to gameviewcontroller by level
Allows for multiple light bulbs

Allows for multiple light bulbs to be on the board and checks for
connection all of them.
Tests were modified to test for the two light bulb case.
Merge pull request #1 from zsweedyk/MultipleBulbFeature

Allows for multiple light bulbs, and Cyrus will initialize _numLevel in a later merge request
program the segue structure instead of doing them in storyboard;
now the view controllers can pass language and level info between;
add chinese infos (spanish to be added);
implement short features, but will modify them after combining with sean's change;
add level3 to test short
modify game model based on sean's change
resolved git conflicts
resolved git conflicts in test file
implement short features (the bulb will turn black the the circuit is short)
merge branch 'PowerUP_sound' into PowerUPBeta
Merge remote-tracking branch 'origin/PowerUPBeta' into PowerUPBeta
merge from PowerUP_sound manually
Delete Sound.h
Delete Sound.m
add level 4 for multi-bulb
fix one warning