changed the name of a zombie in the input files
added cone and flag zombie to the zombie factory
tested the levels from 1 to 5
removed unused methods
Merge branch 'master' of https://github.com/tmzhuang/pvz-reloaded

# By Arzaan Irani (1) and Christopher Nguyen (1)
# Via Christopher Nguyen
* 'master' of https://github.com/tmzhuang/pvz-reloaded:
  Fix issues that some people introduced ^^
  Added in MUD terrain.