add third_party dir to git ignores
fix sgvectors' refcount - to 0 -> ref -> 1 upon init
Merge pull request #1419 from votjakovr/develop

Add third_party dir to git ignores
Removed duplicate mutex initialization.
Fix spinlock detection with clang
Add the right pthread library flag to the linking flags
Fix location of try_compile of spinlock test
Write suport for opertor new and delete using Jemalloc
Now comparing vector to clone (was: vector to itself)
fix doc Makefile
Merge pull request #1426 from tklein23/fix_sparse_vector_unit_test

Fixed SGVectorTest: Now comparing vector to clone (was: vector to itself)
pull up common functionality of inference method classes
fix warnings in libshogun examples
Change order of include dirs in unit tests cmake
fix doxygen warning
Merge pull request #1427 from iglesias/develop

Change order of include dirs in unit tests cmake
Fix package finder scripts for Jemalloc and Hoard
when using jemalloc simply bundle it
Unify memory allocation calls accross the library
Merge pull request #1428 from votjakovr/feature/gp_refactoring

Pull up common functionality of inference method classes
Merge pull request #1429 from votjakovr/feature/fix_doxygen_warning

Fix doxygen warning
PCA default initialization for LMNN