DB/Quest: Fixes Gino's visibility and quest chain

By nelegalno and Rushor, closes #9030
DB/Misc: Set comment of creature_classlevelstats to text

By Magnifikator closes #11762
Core/Logging: Fixed filenames of backup logs

Closes #11765
Update README.md
DB/Quest: Fix wrong ExclusiveGroup

By untaught, Closes #11715
DB/SAI: Fix Dun Garok Rifleman spam

By dr-j, closes #11773
DB/SAI: Umpi

By dr-j, closes #11775
DB/SAI: Elemental Slave

By untaught, updates #11742
DB/SAI: Ferocious Yeti spamming Berserk

By dr-j closes #11776
Update readme for cmake version for c++11 stuff
DB/Misc: Miscellaneous fixes

By dr-j, closes #11780
Fix wrong loot in two chests for quest 'The Shadow Tomb'.
Fix turning in of 13120 Deaths Gaze.
Fix torching sunfury hold.
Cmake: Added level restriction for msvc 2013
Update 2014_03_24_02_world_creature_classlevelstats.sql
DB/Quest; Fix Preying Upon the Weak traps

By untaught, closes #6858
Core/Misc: Fix assertion triggered

Change an assertion added in 6dcd8c8545a65a7bfbd0daaa16f650d8c3a90262 with a NULL check, properly handling the case of a NULL parameter.
Fixes #11771
DB/Creature: Fix Living Storm coords

By Magnifikator closes #11785
Buildsystem: Changed required CMake version to 2.8.9 and removed a check for version we no longer support in msvc settings
Build system: Fix clang build

See wiki for latest build instructions under Mac OS X!
Scripts/Icecrown Citadel: Fixed Muradin/Saurfang attacking each other during Gunship Battle

Closes #11786
Core/SAI: Implement two new event types that are triggered when a certain creature/gameobject entry or guid gets within a given distance of the source.