[mr2698] check deleted flag in some WorldState cycles. possible speedup. related to #1318
[12365] fix Singleton compile error on clang

some members of Singleton were implicitly specialized in the static function
definitions, which conflicted with the initialization of said members (clang
saw it as a redefinition of the specialization)

Signed-off-by: DasBlub <DasBlub@gmail.com>

Conflicts:
	src/framework/Policies/SingletonImp.h
	src/game/AccountMgr.cpp
	src/game/ObjectMgr.cpp
	src/game/SkillDiscovery.cpp
	src/shared/revision_nr.h
[12367] fix clang compile error from call of templated member function

Signed-off-by: DasBlub <DasBlub@gmail.com>
[12369] Add continued integration support using Travis CI

Every push to a repository will start a new build on travis which will
make sure that CMaNGOS still builds. Currently, Travis only supports gcc
and clang on linux, Windows and OS X build test is not yet available.

Thanks to @travis-ci for their awesome software and their
sponsors for providing the infrastructure!
For the current build status of this repository, go to https://travis-ci.org/cmangos/mangos-wotlk/
[12371] Implement spell effects for spells 74452 and 74455

Also limit the targets of 74452 depending on dungeon difficulty
[12372] Use recently introduced performance timer for additional state updates

This should give a slight performance improvement without visibly disadvantage for players.
Maybe someone is willing to test 200 as default check intervall, how this scales
[ci skip] (mostly rename :P )

Conflicts:
	src/game/Player.cpp
[12373] Don't send Spell::CheckCast fail result for passive auras

No need to notify client when a passive aura failed to cast (like using Cat Form indoor with Feral Swiftness talent learned).

Contributor Maxxie.
SD2 update