Script/Commands: Implement command to list the members of a group/party.
Fix Typo.
Update README

TrinityCore Requirements
Platform: Linux, Windows or Mac
Processor with SSE2 support
ACE ≥ 5.8.3
MySQL ≥ 5.1.0
CMake ≥ 2.8.0
OpenSSL ≥ 0.9.8o
GCC ≥ 4.3 (Linux only)
MS Visual Studio ≥ 9 (2008) (Windows only)