Added name attribute in CFG
GetExit nodes is no good. Have edge labes implemented.
Merge branch 'master' of https://github.com/gatech/php2014

Conflicts:
	.DS_Store
	CFG_FROM_PHP/src/main/File_operator.java
Defs and Uses are computed.
Fixed node coloring in graphviz. Fixed block_no after splitting a block.
1. getCFG() now calls getDefinitions(), getUses(), and getKills(). Instead of doing them seperately.
2. Added getKills() in CFG. Not yet working.
3. Added toString to Defs_Uses
Begining the visualization of the gen set.
Fixed getKills(). Now working.
Merge branch 'master' of https://github.com/gatech/php2014

Conflicts:
	CFG_FROM_PHP/src/CFG/BasicBlock.java
	CFG_FROM_PHP/src/CFG/CFG.java
	CFG_FROM_PHP/src/CFG/Defs_Uses.java
	CFG_FROM_PHP/src/main/File_operator.java
Merge branch 'master' of https://github.com/gatech/php2014
Defs and Uses are computed and visualized