EMBB 0.3.2

Features:

• Added central spinlock implementation for C/C++ and removed existing (decentral) ones

Changes and improvements:

• Reworked and optimized hazard pointer implementation
• Adjusted interfaces of value pool and object pool
• Replaced C style casts

Bug fixes:

• Fixed ordering of destruction and deallocation in value pool
• Fixed potential use of uninitialized memory in WaitFreeArrayValuePool and LockFreeTreeValuePool

Build system:

• Given user the ability to append compiler flags
• Let Cmake return an error on Doxygen warnings when WARNINGS_ARE_ERRORS is enabled
• Fixed cpplint warnings

Documentation:

• Added mutex concept
• Corrected library ordering/names in README (section "Using the Library")
• Improved exception messages
• Fixed typos in condition_var_test.cc